A019005 - OEIS

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A019005 as a simple table

n	a(n)
2	2
3	11
4	47
5	226
6	1031
7	5123
8	29360
9	184852
10	1234090
11	8398984
12	57386553
13	390864157
14	2652252310
15	17975308362
16	122088975542

[2,11,47,226,1031,5123,29360,184852,1234090, 8398984,57386553,390864157,2652252310,17975308362, 122088975542]