A087152 - OEIS

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A087152 as a simple table

n	a(n)
1	1
2	3
3	20
4	194
5	2554
6	42226
7	843744
8	19769256
9	531768120
10	16152296424
11	546895099200
12	20425461026736
13	834215500905552
14	36988602430554576
15	1769524998544143360
16	90851799797294235264
17	4982968503277896871296

[1,3,20,194,2554,42226,843744,19769256,531768120, 16152296424,546895099200,20425461026736, 834215500905552,36988602430554576, 1769524998544143360,90851799797294235264, 4982968503277896871296]