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A219397
as a simple table
n
a(n)
1
1
2
2
3
16
4
165
5
3668
6
157672
7
13982113
8
2515924143
9
901586411968
10
639594948102158
[1,2,16,165,3668,157672,13982113,2515924143, 901586411968,639594948102158]