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A181382
as a simple table
n
a(n)
0
1
1
33
2
613
3
8809
4
115591
5
1429431
6
16990171
7
196502733
8
2228124073
9
24887020821
[1,33,613,8809,115591,1429431,16990171,196502733, 2228124073,24887020821]