A281293 - OEIS

A281293 as a simple table

n	a(n)
2	1
3	0
4	3
5	0
6	3
7	6
8	0
9	3
10	15
11	10
12	0
13	3
14	27
15	45
16	15
17	0
18	3
19	42
20	126
21	105
22	21
23	0
24	3
25	60
26	280
27	420
28	210
29	28
30	0
31	3
32	81
33	540
34	1260
35	1134
36	378
37	36
38	0
39	3
40	105
41	945
42	3150
43	4410
44	2646
45	630
46	45
47	0
48	3
49	132
50	1540
51	6930
52	13860
53	12936
54	5544
55	990
56	55
57	0
58	3
59	162
60	2376
61	13860
62	37422
63	49896
64	33264
65	10692
66	1485
67	66

[1,0,3,0,3,6,0,3,15,10,0,3,27,45,15,0,3,42,126, 105,21,0,3,60,280,420,210,28,0,3,81,540,1260,1134, 378,36,0,3,105,945,3150,4410,2646,630,45,0,3,132, 1540,6930,13860,12936,5544,990,55,0,3,162,2376, 13860,37422,49896,33264,10692,1485,66]