A374313 - OEIS

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A374313 as a simple table

n	a(n)
3	0
4	0
5	1
6	1
7	1
8	3
9	4
10	10
11	32
12	167
13	899
14	6470
15	55815
16	549981
17	6155795
18	78520177
19	1123544810
20	18005054988
21	322434738089
22	6427598615569

[0,0,1,1,1,3,4,10,32,167,899,6470,55815,549981, 6155795,78520177,1123544810,18005054988, 322434738089,6427598615569]