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A238841
as a simple table
n
a(n)
1
0
2
8
3
50
4
352
5
282475258
6
232630513987258
7
418377847259091645147530834859099334519176045887014771594
[0,8,50,352,282475258,232630513987258, 41837784725909164514753083485909933451917604588701\ 4771594]