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A296032
as a simple table
n
a(n)
1
1
2
5
3
31
4
204
5
8472
6
472540
7
39608385
8
10042412853
9
5131681923323
10
4854151578229861
11
10472350366798925062
[1,5,31,204,8472,472540,39608385,10042412853, 5131681923323,4854151578229861, 10472350366798925062]