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A240582
as a simple table
n
a(n)
1
1
2
4
3
27
4
256
5
3750
6
77760
7
1728720
8
55494528
9
1948916016
10
146502720000
11
9131329626090
[1,4,27,256,3750,77760,1728720,55494528, 1948916016,146502720000,9131329626090]