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A063573
as a simple table
n
a(n)
0
1
1
2
2
10
3
170
4
33490
5
1133870930
6
1285739648704587610
7
1653126447166808568966775665261637370
[1,2,10,170,33490,1133870930,1285739648704587610, 1653126447166808568966775665261637370]