A086635 - OEIS

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A086635 as a simple table

n	a(n)
0	1
1	2
2	5
3	24
4	137
5	833
6	5301
7	34946
8	236640
9	1636524
10	11510571
11	82088700
12	592216248
13	4314349823
14	31694295852
15	234526323852
16	1746433537565
17	13077886182237
18	98418652886229
19	743950197805239

[1,2,5,24,137,833,5301,34946,236640,1636524, 11510571,82088700,592216248,4314349823, 31694295852,234526323852,1746433537565, 13077886182237,98418652886229,743950197805239]