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A177288
as a simple table
n
a(n)
1
1
2
6
3
90
4
2520
5
113400
6
7484400
7
681080400
8
81729648000
9
7580424852000
10
569159625434400
11
36636506215016400
[1,6,90,2520,113400,7484400,681080400,81729648000, 7580424852000,569159625434400,36636506215016400]