A209490 - OEIS

A209490 as a simple table

n	a(n)
3	1
4	0
5	3
6	0
7	0
8	8
9	0
10	0
11	4
12	20
13	0
14	0
15	0
16	15
17	47
18	0
19	0
20	0
21	0
22	37
23	107
24	0
25	0
26	0
27	0
28	16
29	87
30	238
31	0
32	0
33	0
34	0
35	0
36	60
37	200
38	520
39	0
40	0
41	0
42	0
43	0
44	0
45	169
46	448
47	1121
48	0
49	0
50	0
51	0
52	0
53	0
54	64
55	387
56	992
57	2391
58	0
59	0
60	0
61	0
62	0
63	0
64	0
65	240
66	865
67	2160
68	5056

[1,0,3,0,0,8,0,0,4,20,0,0,0,15,47,0,0,0,0,37,107, 0,0,0,0,16,87,238,0,0,0,0,0,60,200,520,0,0,0,0,0, 0,169,448,1121,0,0,0,0,0,0,64,387,992,2391,0,0,0, 0,0,0,0,240,865,2160,5056]