Starting with polynomial:
P : 5/2*t^3 - 3/2*t
Extension levels are: 3 4
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Trying to find an order 4 Kronrod extension for:
P1 : 5/2*t^3 - 3/2*t
Solvable: 1
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Ending with final polynomial:
P : 5/2*t^7 - 77/18*t^5 + 3745/1782*t^3 - 155/594*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:
| (0.96049126870802028342 + 4.7068747365290705425e-183j)  +/-  (2.27e-62, 2.27e-62j)
| (-0.77459666924148337704 - 1.1222063866923023564e-190j)  +/-  (2.57e-62, 2.57e-62j)
| (-0.96049126870802028342 + 1.7350892970870645566e-201j)  +/-  (1.87e-62, 1.87e-62j)
| (-0.434243749346802558 - 4.7527289157378995588e-211j)  +/-  (7.13e-63, 7.13e-63j)
| (0.434243749346802558 - 1.2691155399385565533e-216j)  +/-  (7.13e-63, 7.13e-63j)
| (0.77459666924148337704 - 1.0468752718955079667e-224j)  +/-  (2.57e-62, 2.57e-62j)
| (-1.9656826079092814051e-236 + 5.8970478237278442153e-236j)  +/-  (4.35e-235, 4.35e-235j)
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The weights are:
| (0.10465622602646726519 - 4.9923721979241100497e-183j)  +/-  (6.14e-27, 2.48e-57j)
| (0.26848808986833344073 + 7.7874471107884228779e-184j)  +/-  (2.68e-27, 1.09e-57j)
| (0.10465622602646726519 - 2.5643328360362285703e-184j)  +/-  (1.41e-27, 5.7e-58j)
| (0.40139741477596222291 - 1.3546137107164499263e-183j)  +/-  (9.67e-28, 3.97e-58j)
| (0.40139741477596222291 - 3.5901876266703894545e-183j)  +/-  (4.59e-28, 1.82e-58j)
| (0.26848808986833344073 + 7.2685844676752946979e-183j)  +/-  (3.1e-28, 1.19e-58j)
| (0.45091653865847414235 + 2.1462776401604353018e-183j)  +/-  (3.06e-28, 1.28e-58j)
