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A215790
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
10
6
29
7
262
8
932
9
11694
10
46988
11
727846
12
3166688
13
56797272
14
261286670
15
5219906670
16
25024705056
[1,1,1,2,10,29,262,932,11694,46988,727846,3166688, 56797272,261286670,5219906670,25024705056]