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A177593
as a simple table
n
a(n)
1
1
2
6
3
90
4
2518
5
113052
6
7434180
7
673334112
8
80360724360
9
12221802614520
10
2307379944600182
[1,6,90,2518,113052,7434180,673334112,80360724360, 12221802614520,2307379944600182]