A056096 - OEIS

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A056096 as a simple table

n	a(n)
3	1
4	4
5	17
6	80
7	403
8	2128
9	11628
10	65208
11	373175
12	2170740
13	12797265
14	76292736
15	459162452
16	2786017120
17	17024247304
18	104673837384
19	647113502847
20	4020062732140

[1,4,17,80,403,2128,11628,65208,373175,2170740, 12797265,76292736,459162452,2786017120, 17024247304,104673837384,647113502847, 4020062732140]