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A129613
as a simple table
n
a(n)
0
1
1
1
2
1
3
1
4
1
5
15
6
66747
7
475425
8
12124167
9
14899339905
10
8073774344085
[1,1,1,1,1,15,66747,475425,12124167,14899339905, 8073774344085]