Starting with polynomial:
P : 16*t^4 - 48*t^2 + 12
Extension levels are: 4 11
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Trying to find an order 11 Kronrod extension for:
P1 : 16*t^4 - 48*t^2 + 12
Solvable: 1
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Ending with final polynomial:
P : 16*t^15 - 2564/3*t^13 + 116464/7*t^11 - 1045605/7*t^9 + 4515555/7*t^7 - 5082165/4*t^5 + 1931985/2*t^3 - 2916045/16*t
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Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
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The nodes are:
| (-3.6927320602322334284 - 1.2870360607696677265e-185j)  +/-  (2.22e-60, 2.22e-60j)
| (-4.6758378429530981643 - 2.1321921347153744771e-189j)  +/-  (6.5e-61, 6.5e-61j)
| (2.2679277353884325143 + 2.1041369750480669182e-191j)  +/-  (1.33e-60, 1.33e-60j)
| (-2.9368597740916132369 - 1.8835861593040963623e-194j)  +/-  (2.42e-60, 2.42e-60j)
| (2.9368597740916132369 + 1.9263949356519167342e-194j)  +/-  (2.59e-60, 2.59e-60j)
| (0.52464762327529031788 - 1.2247689155908690988e-201j)  +/-  (8.84e-63, 8.84e-63j)
| (4.6758378429530981643 - 9.3442452666539695645e-207j)  +/-  (6.94e-61, 6.94e-61j)
| (-1.071585516319553479 - 2.4333972048578045741e-207j)  +/-  (6.72e-62, 6.72e-62j)
| (-1.6506801238857845559 - 7.6043662651806392941e-211j)  +/-  (3.74e-61, 3.74e-61j)
| (3.6927320602322334284 + 4.1063577831975452188e-209j)  +/-  (2.18e-60, 2.18e-60j)
| (1.6506801238857845559 + 1.3924010495325877614e-214j)  +/-  (3.79e-61, 3.79e-61j)
| (-2.2679277353884325143 + 1.438555212332696986e-220j)  +/-  (1.25e-60, 1.25e-60j)
| (1.071585516319553479 - 2.2794864791273157338e-225j)  +/-  (6.72e-62, 6.72e-62j)
| (-0.52464762327529031788 - 1.1322331821557460893e-233j)  +/-  (8.84e-63, 8.84e-63j)
| (1.9917848309551348619e-242 + 1.347383856234355936e-242j)  +/-  (3.61e-241, 3.61e-241j)
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The weights are:
| (5.5644129458151343998e-07 - 2.630437287849021382e-191j)  +/-  (1.05e-23, 3.58e-53j)
| (2.3455116499489024503e-10 - 1.8582412326356680297e-193j)  +/-  (3.01e-25, 1.02e-54j)
| (0.0021068104520711942068 - 8.7414443083305726615e-191j)  +/-  (2.12e-22, 7.19e-52j)
| (7.1244098289090788501e-05 + 1.1223156901428971961e-190j)  +/-  (4.46e-23, 1.51e-52j)
| (7.1244098289090788501e-05 + 1.2785091129306502974e-191j)  +/-  (4.14e-24, 1.41e-53j)
| (0.22841302707707856673 + 2.139195420262005913e-189j)  +/-  (4.77e-22, 1.62e-51j)
| (2.3455116499489024503e-10 + 2.182337488097630533e-194j)  +/-  (2.27e-27, 7.7e-57j)
| (0.10059572433770356288 - 1.9448675767725078459e-189j)  +/-  (1.79e-22, 6.06e-52j)
| (0.022077688383356701295 + 9.7220555080082583639e-190j)  +/-  (6.28e-23, 2.13e-52j)
| (5.5644129458151343998e-07 - 9.6925818099291362174e-193j)  +/-  (8.02e-26, 2.72e-55j)
| (0.022077688383356701295 + 3.7179783040416225831e-190j)  +/-  (3.03e-23, 1.03e-52j)
| (0.0021068104520711942068 - 3.6524503246998009535e-190j)  +/-  (2.98e-24, 1.02e-53j)
| (0.10059572433770356288 - 1.0702833631386001343e-189j)  +/-  (7.31e-23, 2.48e-52j)
| (0.22841302707707856673 + 2.8474030897682977128e-189j)  +/-  (4.49e-23, 1.52e-52j)
| (0.29346989795131027519 - 2.960370504106628423e-189j)  +/-  (4.96e-23, 1.66e-52j)
