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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A251968 as a simple table

na(n)
1256
220000
36250000
41500625000
5922368160000
6410018473428480
7371968759094317056
8244967687215822061568
9286806250077948918890496
10248333886971163312349814784
11348300471444720308054703841536

[256,20000,6250000,1500625000,922368160000,
 410018473428480,371968759094317056,
 244967687215822061568,286806250077948918890496,
 248333886971163312349814784,
 348300471444720308054703841536]