A287887 - OEIS

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A287887 as a simple table

n	a(n)
1	1
2	1
3	3
4	10
5	40
6	168
7	764
8	3589
9	17460
10	86858
11	440507
12	2267491
13	11819232
14	62250491
15	330794053
16	1771283115
17	9547905381

[1,1,3,10,40,168,764,3589,17460,86858,440507, 2267491,11819232,62250491,330794053,1771283115, 9547905381]