A086929 - OEIS

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A086929 as a simple table

n	a(n)
1	1
2	2
3	9
4	84
5	345
6	864
7	35217
8	180504
9	5586408
10	43430850
11	530676234
12	9780239700
13	1055666381913
14	18372986892414
15	818136466402365
16	314063593211808
17	139031163059145687
18	9080662161749058738
19	64855015790195124351

[1,2,9,84,345,864,35217,180504,5586408,43430850, 530676234,9780239700,1055666381913,18372986892414, 818136466402365,314063593211808, 139031163059145687,9080662161749058738, 64855015790195124351]