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A000851
as a simple table
n
a(n)
1
8
2
50
3
2908
4
115125476
5
30952209248265753648
6
608172074158442696987382009681097839529937904
[8,50,2908,115125476,30952209248265753648, 608172074158442696987382009681097839529937904]