A056299 - OEIS

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A056299 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	3
8	36
9	296
10	2303
11	16317
12	110462
13	717024
14	4532105
15	28046285
16	170938814
17	1029749994
18	6149327905
19	36477979041
20	215304158916
21	1265984738264
22	7422971231829
23	43433472086235
24	253759842223290

[0,0,0,0,0,1,3,36,296,2303,16317,110462,717024, 4532105,28046285,170938814,1029749994,6149327905, 36477979041,215304158916,1265984738264, 7422971231829,43433472086235,253759842223290]