A155304 - OEIS

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A155304 as a simple table

n	a(n)
4	1
5	13
6	37
7	73
8	309
9	2413
10	28415
11	205131
12	1898471
13	29029014
14	631146446
15	14579044094
16	368315888227
17	12424744049760
18	572778669577292

[1,13,37,73,309,2413,28415,205131,1898471, 29029014,631146446,14579044094,368315888227, 12424744049760,572778669577292]