A000663 - OEIS

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A000663 as a simple table

n	a(n)
0	1
1	2
2	9
3	37
4	183
5	933
6	5314
7	32043
8	207212
9	1415934
10	10200289
11	77018442
12	607474564
13	4987909231
14	42519634303
15	375395726926

[1,2,9,37,183,933,5314,32043,207212,1415934, 10200289,77018442,607474564,4987909231, 42519634303,375395726926]