A235937 - OEIS

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A235937 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	2
7	11
8	62
9	408
10	3056
11	25821
12	242802
13	2517303
14	28540102
15	351383192
16	4669815008
17	66640974977
18	1016522211474
19	16507095990251
20	284343231536742
21	5178919228252440

[0,0,0,0,1,2,11,62,408,3056,25821,242802,2517303, 28540102,351383192,4669815008,66640974977, 1016522211474,16507095990251,284343231536742, 5178919228252440]