Starting with polynomial:
P : t
Extension levels are: 1 20
-------------------------------------------------
Trying to find an order 20 Kronrod extension for:
P1 : t
Solvable: 1
-------------------------------------------------
Ending with final polynomial:
P : t^21 - 210/41*t^19 + 5985/533*t^17 - 271320/19721*t^15 + 203490/19721*t^13 - 81396/16687*t^11 + 67830/47027*t^9 - 348840/1363783*t^7 + 33915/1363783*t^5 - 4522/4091349*t^3 + 2261/156835045*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: 1
  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:
| (-0.99375217062038950026 + 1.880573802457669438e-288j)  +/-  (1.59e-121, 1.59e-121j)
| (0.99375217062038950026 + 4.955682051689686876e-287j)  +/-  (1.58e-121, 1.58e-121j)
| (-0.96722683856630629432 - 1.3754200425254299367e-299j)  +/-  (3.67e-121, 3.67e-121j)
| (-0.14556185416089509094 + 1.7753153005417872254e-299j)  +/-  (8.53e-127, 8.53e-127j)
| (0.92009933415040082879 - 2.5870439005300575346e-308j)  +/-  (3.3e-121, 3.3e-121j)
| (0.76843996347567790862 + 1.1304569754261814578e-329j)  +/-  (7.38e-122, 7.38e-122j)
| (0.96722683856630629432 - 1.238113446947987053e-345j)  +/-  (3.94e-121, 3.94e-121j)
| (-0.76843996347567790862 - 1.2259587528311817996e-353j)  +/-  (6.26e-122, 6.26e-122j)
| (-0.55161883588721980706 - 7.7569702226139906103e-362j)  +/-  (2.18e-123, 2.18e-123j)
| (0.55161883588721980706 + 1.4997159525901721202e-370j)  +/-  (2.27e-123, 2.27e-123j)
| (0.85336336458331728365 + 1.7110450787946935985e-384j)  +/-  (1.94e-121, 1.94e-121j)
| (0.14556185416089509094 - 1.2983191357182932136e-394j)  +/-  (8.53e-127, 8.53e-127j)
| (-0.42434212020743878357 - 1.0183866514359186779e-397j)  +/-  (2.33e-124, 2.33e-124j)
| (-0.85336336458331728365 + 2.248141601795087891e-397j)  +/-  (1.79e-121, 1.79e-121j)
| (1.2390246476472996555e-396 - 3.0179851613858520156e-397j)  +/-  (2.68e-395, 2.68e-395j)
| (0.66713880419741231931 + 2.1652725147846589625e-399j)  +/-  (1.65e-122, 1.65e-122j)
| (0.42434212020743878357 - 1.0644135367079235949e-402j)  +/-  (2.49e-124, 2.49e-124j)
| (-0.92009933415040082879 - 6.1790031338796026003e-404j)  +/-  (3.47e-121, 3.47e-121j)
| (-0.66713880419741231931 - 1.7818514750649633207e-406j)  +/-  (1.51e-122, 1.51e-122j)
| (-0.2880213168024010966 - 1.1142741973474659969e-408j)  +/-  (1.46e-125, 1.46e-125j)
| (0.2880213168024010966 + 1.1295126299564343761e-404j)  +/-  (1.59e-125, 1.59e-125j)
-------------------------------------------------
The weights are:
| (0.016017228257774333324 + 2.0036328915241360211e-288j)  +/-  (7.21e-45, 5.8e-103j)
| (0.016017228257774333324 - 6.3308875939803184996e-287j)  +/-  (1.85e-45, 1.49e-103j)
| (0.0369537897708524938 - 2.5253405895025224374e-288j)  +/-  (3.35e-45, 2.7e-103j)
| (0.14452440398997005906 + 1.7605664525839595119e-287j)  +/-  (1.55e-46, 1.25e-104j)
| (0.057134425426857208284 - 7.1327787246730364605e-287j)  +/-  (7.43e-46, 5.98e-104j)
| (0.093444423456033861553 - 4.8551603055355972147e-287j)  +/-  (2.1e-46, 1.69e-104j)
| (0.0369537897708524938 + 1.0335441172982410415e-286j)  +/-  (7.48e-46, 6.02e-104j)
| (0.093444423456033861553 - 4.3866174739956661828e-288j)  +/-  (2.07e-47, 1.66e-105j)
| (0.1218314160537285342 - 9.182494171450484213e-288j)  +/-  (1.28e-47, 1.03e-105j)
| (0.1218314160537285342 - 3.6601479957142636292e-287j)  +/-  (1.42e-47, 1.14e-105j)
| (0.076100113628379302017 + 5.7398990051980648903e-287j)  +/-  (8.59e-47, 6.91e-105j)
| (0.14452440398997005906 + 2.4214629900189536458e-287j)  +/-  (3.59e-48, 2.89e-106j)
| (0.13226893863333746178 + 1.1816665745467818218e-287j)  +/-  (1.91e-48, 1.55e-106j)
| (0.076100113628379302017 + 2.1907239984254055939e-288j)  +/-  (2.76e-49, 2.26e-107j)
| (0.14608113364969042719 - 2.0792875284552715698e-287j)  +/-  (2.45e-48, 1.96e-106j)
| (0.10879729916714837766 + 4.1960096339593485826e-287j)  +/-  (1.92e-48, 1.54e-106j)
| (0.13226893863333746178 + 3.2005288646466583105e-287j)  +/-  (8.28e-49, 6.7e-107j)
| (0.057134425426857208284 - 3.8306286710318221504e-290j)  +/-  (9.81e-50, 8.14e-108j)
| (0.10879729916714837766 + 6.7092039315424030435e-288j)  +/-  (2.14e-49, 1.78e-107j)
| (0.13988739479107315472 - 1.4620288748204621129e-287j)  +/-  (1.87e-49, 1.61e-107j)
| (0.13988739479107315472 - 2.7923639007405230514e-287j)  +/-  (1.5e-49, 1.07e-107j)
