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A177578
as a simple table
n
a(n)
1
1
2
6
3
90
4
2510
5
111924
6
7292080
7
653417953
8
77078901216
9
11579203589017
10
2158323961477372
[1,6,90,2510,111924,7292080,653417953,77078901216, 11579203589017,2158323961477372]