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A303010
as a simple table
n
a(n)
1
1
2
8
3
68
4
1047
5
27719
6
1298140
7
121524556
8
18974341664
9
5433457482034
[1,8,68,1047,27719,1298140,121524556,18974341664, 5433457482034]