A396504 - OEIS

A396504 as a simple table

n	a(n)
0	1
1	1
2	0
3	1
4	2
5	0
6	1
7	4
8	20
9	0
10	1
11	6
12	56
13	392
14	0
15	1
16	8
17	108
18	1432
19	11664
20	0
21	1
22	10
23	176
24	3408
25	54144
26	468512
27	0
28	1
29	12
30	260
31	6608
32	156240
33	2730784
34	23762752
35	0
36	1
37	14
38	360
39	11320
40	355968
41	9468096
42	172930816
43	1458000000
44	0
45	1
46	16
47	476
48	17832
49	700560
50	25170368
51	716663232
52	13214614144
53	105046700288
54	0

[1,1,0,1,2,0,1,4,20,0,1,6,56,392,0,1,8,108,1432, 11664,0,1,10,176,3408,54144,468512,0,1,12,260, 6608,156240,2730784,23762752,0,1,14,360,11320, 355968,9468096,172930816,1458000000,0,1,16,476, 17832,700560,25170368,716663232,13214614144, 105046700288,0]