A220636 - OEIS

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A220636 as a simple table

n	a(n)
1	1
2	1
3	13
4	351
5	8560
6	183961
7	3817452
8	79063898
9	1643423543
10	34184820039
11	711142299027
12	14793696906106
13	307746212613995
14	6401868705356519
15	133174202661890384
16	2770341001987547086
17	57629691849567578540

[1,1,13,351,8560,183961,3817452,79063898, 1643423543,34184820039,711142299027, 14793696906106,307746212613995,6401868705356519, 133174202661890384,2770341001987547086, 57629691849567578540]