A178923 - OEIS

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A178923 as a simple table

n	a(n)
1	1
2	0
3	0
4	0
5	2
6	0
7	0
8	2
9	0
10	0
11	0
12	2
13	6
14	0
15	0
16	0
17	2
18	18
19	0
20	0
21	0
22	0
23	2
24	42
25	24
26	0
27	0
28	0
29	0
30	2
31	90
32	144
33	0
34	0
35	0
36	0
37	0
38	2
39	186
40	600
41	120
42	0
43	0
44	0
45	0
46	0
47	2
48	378
49	2160
50	1200
51	0
52	0
53	0
54	0
55	0

[1,0,0,0,2,0,0,2,0,0,0,2,6,0,0,0,2,18,0,0,0,0,2, 42,24,0,0,0,0,2,90,144,0,0,0,0,0,2,186,600,120,0, 0,0,0,0,2,378,2160,1200,0,0,0,0,0]