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A177591
as a simple table
n
a(n)
1
1
2
6
3
90
4
2482
5
109476
6
7045740
7
623113066
8
72495993816
9
10736006696280
10
1971973147757382
[1,6,90,2482,109476,7045740,623113066,72495993816, 10736006696280,1971973147757382]