A115951 - OEIS

A115951 as a simple table

n	a(n)
0	1
1	0
2	2
3	0
4	2
5	6
6	0
7	0
8	12
9	20
10	0
11	0
12	6
13	60
14	70
15	0
16	0
17	0
18	60
19	280
20	252
21	0
22	0
23	0
24	20
25	420
26	1260
27	924
28	0
29	0
30	0
31	0
32	280
33	2520
34	5544
35	3432
36	0
37	0
38	0
39	0
40	70
41	2520
42	13860
43	24024
44	12870
45	0
46	0
47	0
48	0
49	0
50	1260
51	18480
52	72072
53	102960
54	48620
55	0
56	0
57	0
58	0
59	0
60	252
61	13860
62	120120
63	360360
64	437580
65	184756

[1,0,2,0,2,6,0,0,12,20,0,0,6,60,70,0,0,0,60,280, 252,0,0,0,20,420,1260,924,0,0,0,0,280,2520,5544, 3432,0,0,0,0,70,2520,13860,24024,12870,0,0,0,0,0, 1260,18480,72072,102960,48620,0,0,0,0,0,252,13860, 120120,360360,437580,184756]