A056485 - OEIS

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A056485 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	1
12	1
13	21
14	21
15	266
16	266
17	2646
18	2646
19	22827
20	22827
21	179487
22	179486
23	1323652
24	1323651
25	9321312
26	9321291
27	63436373
28	63436352
29	420693273
30	420693007
31	2734926558

[0,0,0,0,0,0,0,0,0,0,1,1,21,21,266,266,2646,2646, 22827,22827,179487,179486,1323652,1323651,9321312, 9321291,63436373,63436352,420693273,420693007, 2734926558]