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A296108
as a simple table
n
a(n)
1
1
2
2
3
6
4
16
5
503
6
29003
7
1993970
8
1061506422
9
1365762093736
10
2515747231264231
[1,2,6,16,503,29003,1993970,1061506422, 1365762093736,2515747231264231]