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A317511 as a simple table

na(n)
11
28
3255
432256
516198017
632289056648
7255495837970145
88025093993437265376
91000586105494959749616796
10495218382735595839495210771842
11972919685981025490418238840100646750

[1,8,255,32256,16198017,32289056648,
 255495837970145,8025093993437265376,
 1000586105494959749616796,
 495218382735595839495210771842,
 972919685981025490418238840100646750]