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A177592
as a simple table
n
a(n)
1
1
2
6
3
90
4
2512
5
112440
6
7367330
7
664573798
8
78969593280
9
11955422386863
10
2246458143581603
[1,6,90,2512,112440,7367330,664573798,78969593280, 11955422386863,2246458143581603]