A155341 - OEIS

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A155341 as a simple table

n	a(n)
4	1
5	4
6	10
7	22
8	55
9	194
10	784
11	4435
12	26044
13	168125
14	1273021
15	11736308
16	129333849
17	1686140456
18	25343021943
19	443460444588

[1,4,10,22,55,194,784,4435,26044,168125,1273021, 11736308,129333849,1686140456,25343021943, 443460444588]