A155226 - OEIS

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A155226 as a simple table

n	a(n)
3	1
4	7
5	19
6	58
7	329
8	2350
9	20015
10	218371
11	3090717
12	58164789
13	1393078738
14	42785732400
15	1703751776933
16	87700729777393
17	5826804979644472

[1,7,19,58,329,2350,20015,218371,3090717,58164789, 1393078738,42785732400,1703751776933, 87700729777393,5826804979644472]