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A007282
as a simple table
n
a(n)
1
1
2
1
3
1
4
4
5
14
6
74
7
434
8
2876
9
19848
10
143306
11
1062149
12
8058223
13
62259820
14
488630360
15
3886211100
16
31267852668
[1,1,1,4,14,74,434,2876,19848,143306,1062149, 8058223,62259820,488630360,3886211100,31267852668]