A155284 - OEIS

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A155284 as a simple table

n	a(n)
4	1
5	13
6	37
7	73
8	309
9	2413
10	28031
11	212649
12	2010251
13	29604759
14	633868196
15	15160513746
16	396011442436
17	13223926465865
18	597617100526032

[1,13,37,73,309,2413,28031,212649,2010251, 29604759,633868196,15160513746,396011442436, 13223926465865,597617100526032]