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A040082
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
2
6
22
7
564
8
1676267
9
115618721533
10
208904371354363006
11
12216177315369229261482540
[1,1,1,2,2,22,564,1676267,115618721533, 208904371354363006,12216177315369229261482540]