Starting with polynomial:
P : 512*t^9 - 9216*t^7 + 48384*t^5 - 80640*t^3 + 30240*t
Extension levels are: 9 16
-------------------------------------------------
Trying to find an order 16 Kronrod extension for:
P1 : 512*t^9 - 9216*t^7 + 48384*t^5 - 80640*t^3 + 30240*t
Solvable: 1
-------------------------------------------------
Ending with final polynomial:
P : 512*t^25 - 6083322880/100507*t^23 + 1498131978496/502535*t^21 - 40313053170432/502535*t^19 + 653579325206304/502535*t^17 - 6646798339402368/502535*t^15 + 8571063449501280/100507*t^13 - 3151269649461024/9137*t^11 + 7746622727127102/9137*t^9 - 10918862231623164/9137*t^7 + 7966597330394703/9137*t^5 - 2482191962093025/9137*t^3 + 1679491299241665/73096*t
-------------------------------------------------
Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 0
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
  current precision for roots: 212
  current precision for roots: 424
 current precision for weights: 212
Linear system for weights solvable: 1
Sufficient bits for target precision reached
-------------------------------------------------
The nodes are:
| (4.2725166481738075279 - 6.9754307924525466328e-258j)  +/-  (5.29e-122, 5.29e-122j)
| (5.6610546217525296969 - 7.2585313797527643764e-261j)  +/-  (4.29e-123, 4.29e-123j)
| (-3.7087599921007186537 - 2.8652045133726575031e-268j)  +/-  (7.31e-122, 7.31e-122j)
| (-4.2725166481738075279 + 2.577229134212588209e-294j)  +/-  (5.78e-122, 5.78e-122j)
| (-2.7110011389129363759 + 7.1841097430483977496e-318j)  +/-  (3.96e-122, 3.96e-122j)
| (2.7110011389129363759 - 6.7577191638600856498e-328j)  +/-  (3.51e-122, 3.51e-122j)
| (-3.1909932017815276072 - 1.2845038656603014968e-336j)  +/-  (5.78e-122, 5.78e-122j)
| (4.9032717069221579568 + 1.6343174127499098169e-344j)  +/-  (2.17e-122, 2.17e-122j)
| (-4.9032717069221579568 + 2.7841428793095175363e-344j)  +/-  (2.2e-122, 2.2e-122j)
| (-5.6610546217525296969 - 3.6530301302476985323e-346j)  +/-  (4.19e-123, 4.19e-123j)
| (1.0926304732212838946 + 6.6348387728241342592e-347j)  +/-  (2.31e-124, 2.31e-124j)
| (2.2665805845318431118 + 2.5583463375379933618e-344j)  +/-  (1.56e-122, 1.56e-122j)
| (-1.8556048821509409844 + 2.5527628858634606567e-348j)  +/-  (5.51e-123, 5.51e-123j)
| (-1.4685532892166679317 + 5.5664845576392529711e-355j)  +/-  (1.38e-123, 1.38e-123j)
| (3.7087599921007186537 - 3.8150639356042529711e-356j)  +/-  (6.77e-122, 6.77e-122j)
| (1.8556048821509409844 - 7.4434018883396984158e-361j)  +/-  (5.59e-123, 5.59e-123j)
| (1.4685532892166679317 + 1.2069864099072630822e-363j)  +/-  (1.18e-123, 1.18e-123j)
| (3.1909932017815276072 + 9.602011122340071181e-361j)  +/-  (5.99e-122, 5.99e-122j)
| (-1.0926304732212838946 - 2.87859259271896928e-367j)  +/-  (2.25e-124, 2.25e-124j)
| (-2.2665805845318431118 + 2.0937482979809769842e-373j)  +/-  (1.58e-122, 1.58e-122j)
| (-1.4525851937117168089e-386 - 1.0151089908417366961e-386j)  +/-  (4.43e-385, 4.43e-385j)
| (0.72355101875283757332 + 8.2393306304600812135e-386j)  +/-  (2.3e-125, 2.3e-125j)
| (0.3605511345966171375 - 3.5127110659399207451e-387j)  +/-  (2.01e-126, 2.01e-126j)
| (-0.3605511345966171375 - 1.0103002711855251185e-385j)  +/-  (2.01e-126, 2.01e-126j)
| (-0.72355101875283757332 - 1.4138104932643132097e-384j)  +/-  (2.34e-125, 2.34e-125j)
-------------------------------------------------
The weights are:
| (3.9447138673926655302e-09 + 1.4335674411635059453e-265j)  +/-  (3.05e-41, 1.92e-102j)
| (5.9430737265130232597e-15 - 7.8539633553826078388e-270j)  +/-  (3.17e-44, 2e-105j)
| (3.2289243971912738831e-07 - 5.4855058981822840712e-266j)  +/-  (4.53e-41, 2.85e-102j)
| (3.9447138673926655302e-09 + 3.2201363249096292947e-267j)  +/-  (1.14e-42, 7.16e-104j)
| (0.00016761203196173371535 - 4.7776272191208486111e-264j)  +/-  (4.71e-39, 2.96e-100j)
| (0.00016761203196173371535 - 2.1366809481144807517e-263j)  +/-  (2.76e-40, 1.73e-101j)
| (1.0632115014284508674e-05 + 6.0776090613971186782e-265j)  +/-  (2.78e-40, 1.75e-101j)
| (1.3841158408203505329e-11 + 1.4870244477711296437e-267j)  +/-  (3.95e-45, 2.49e-106j)
| (1.3841158408203505329e-11 - 1.0222059027868357859e-268j)  +/-  (4.6e-45, 2.89e-106j)
| (5.9430737265130232597e-15 + 1.0978877128640550563e-270j)  +/-  (4.61e-47, 2.9e-108j)
| (0.063692241378615338625 - 1.4089642105362232671e-261j)  +/-  (5.31e-37, 3.34e-98j)
| (0.0014146036453342076224 + 8.9493361698276176934e-263j)  +/-  (3.9e-41, 2.46e-102j)
| (0.00715259803029377694 - 1.1485224467015122032e-262j)  +/-  (5.13e-40, 3.23e-101j)
| (0.024800092258480523668 + 3.5353312935214167208e-262j)  +/-  (3.68e-39, 2.32e-100j)
| (3.2289243971912738831e-07 - 7.7659823182051401246e-265j)  +/-  (1e-44, 6.29e-106j)
| (0.00715259803029377694 - 2.9120964252653145745e-262j)  +/-  (2.21e-41, 1.39e-102j)
| (0.024800092258480523668 + 7.238530125870727616e-262j)  +/-  (8.42e-41, 5.3e-102j)
| (1.0632115014284508674e-05 + 4.1941043804262623521e-264j)  +/-  (5.73e-44, 3.61e-105j)
| (0.063692241378615338625 - 8.3508382098112639884e-262j)  +/-  (4.94e-41, 3.11e-102j)
| (0.0014146036453342076224 + 2.7453044594617747157e-263j)  +/-  (8.09e-43, 5.09e-104j)
| (0.20329579767766484931 + 2.8404919449414242132e-261j)  +/-  (3.84e-41, 2.42e-102j)
| (0.12220751173248342325 + 2.2021955208523753145e-261j)  +/-  (3.19e-41, 2.01e-102j)
| (0.17890648311798359902 - 2.7810322442319929171e-261j)  +/-  (2.22e-41, 1.4e-102j)
| (0.17890648311798359902 - 2.3481857146527409377e-261j)  +/-  (4.57e-42, 2.91e-103j)
| (0.12220751173248342325 + 1.5643339333491372216e-261j)  +/-  (2.36e-42, 1.44e-103j)
