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A307929
as a simple table
n
a(n)
2
0
3
1
4
4
5
396
6
553008
7
4701600128
8
1782158930138112
9
3276113857736492040192
[0,1,4,396,553008,4701600128,1782158930138112, 3276113857736492040192]