A099269 - OEIS

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A099269 as a simple table

n	a(n)
1	1
2	4
3	32
4	222
5	1610
6	11582
7	83518
8	601974
9	4339414
10	31280470
11	225485414
12	1625410326
13	11716765478
14	84460262198
15	608831511430

[1,4,32,222,1610,11582,83518,601974,4339414, 31280470,225485414,1625410326,11716765478, 84460262198,608831511430]