A221388 - OEIS

A221388 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	1
9	0
10	0
11	0
12	7
13	4
14	0
15	0
16	0
17	38
18	94
19	13
20	0
21	0
22	0
23	190
24	1450
25	1198
26	40
27	0
28	0
29	0
30	918
31	20689
32	52320
33	15181
34	121
35	0
36	0
37	0
38	4367
39	284702
40	2204556
41	1829388
42	191832
43	364
44	0
45	0
46	0
47	20623
48	3856027
49	86673898
50	229338911
51	63358088
52	2420113
53	1093
54	0
55	0
56	0

[0,0,0,0,0,0,0,1,0,0,0,7,4,0,0,0,38,94,13,0,0,0, 190,1450,1198,40,0,0,0,918,20689,52320,15181,121, 0,0,0,4367,284702,2204556,1829388,191832,364,0,0, 0,20623,3856027,86673898,229338911,63358088, 2420113,1093,0,0,0]