A224861 - OEIS

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A224861 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	1
10	4
11	0
12	0
13	3
14	3
15	15
16	0
17	0
18	4
19	9
20	38
21	75
22	0
23	0
24	9
25	9
26	68
27	77
28	604
29	0
30	0
31	13
32	21
33	160
34	311
35	2384
36	4556

[0,0,0,0,0,1,0,0,1,4,0,0,3,3,15,0,0,4,9,38,75,0,0, 9,9,68,77,604,0,0,13,21,160,311,2384,4556]