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A243551
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
14
6
56
7
256
8
1656
9
13952
10
163878
11
2646642
12
59088801
[1,1,2,5,14,56,256,1656,13952,163878,2646642, 59088801]