A155235 - OEIS

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A155235 as a simple table

n	a(n)
3	1
4	4
5	13
6	37
7	152
8	704
9	5022
10	42621
11	420222
12	5313446
13	83504848
14	1668949583
15	41600395450
16	1285489016880
17	49769130940759

[1,4,13,37,152,704,5022,42621,420222,5313446, 83504848,1668949583,41600395450,1285489016880, 49769130940759]