A378074 - OEIS

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A378074 as a simple table

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	9
7	47
8	420
9	4673
10	63253
11	927238
12	14342093
13	229607392
14	3776227106
15	63482545872
16	1087322656758
17	18927037827561

[0,0,0,1,2,9,47,420,4673,63253,927238,14342093, 229607392,3776227106,63482545872,1087322656758, 18927037827561]