A125787 - OEIS

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A125787 as a simple table

n	a(n)
0	1
1	2
2	8
3	52
4	433
5	4276
6	58017
7	855463
8	13670443
9	235745794
10	5122022952
11	115172651558
12	2700441900575
13	66188170219650
14	1696382503295129
15	52131050479431445
16	1631282413260019671
17	52321326819923379190

[1,2,8,52,433,4276,58017,855463,13670443, 235745794,5122022952,115172651558,2700441900575, 66188170219650,1696382503295129,52131050479431445, 1631282413260019671,52321326819923379190]