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A130756
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
15
6
63
7
288
8
1526
9
8627
10
52021
11
328432
12
2160415
[1,1,2,5,15,63,288,1526,8627,52021,328432,2160415]
