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A177583
as a simple table
n
a(n)
1
1
2
6
3
90
4
2504
5
111312
6
7228080
7
645394636
8
75850937208
9
11351113909560
10
2107488874630336
[1,6,90,2504,111312,7228080,645394636,75850937208, 11351113909560,2107488874630336]