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A332637
as a simple table
n
a(n)
1
1
2
2
3
8
4
68
5
1270
6
53200
7
5068960
8
1109820882
9
562711290616
10
664773220895406
[1,2,8,68,1270,53200,5068960,1109820882, 562711290616,664773220895406]