A117776 - OEIS

A117776 as a simple table

n	a(n)
1	1
2	0
3	2
4	0
5	3
6	0
7	12
8	0
9	8
10	0
11	47
12	0
13	106
14	0
15	280
16	0
17	720
18	0
19	1825
20	0
21	5107
22	0
23	14072
24	0
25	38606
26	0
27	107852
28	0
29	301048
30	0
31	852975
32	0
33	2369097
34	0
35	6699177
36	0
37	19111621
38	0
39	54510099
40	0
41	155404674
42	0

[1,0,2,0,3,0,12,0,8,0,47,0,106,0,280,0,720,0,1825, 0,5107,0,14072,0,38606,0,107852,0,301048,0,852975, 0,2369097,0,6699177,0,19111621,0,54510099,0, 155404674,0]

[1,0,2,0,3,0,12,0,8,0,47,0,106,0,280,0,720,0,1825,
 0,5107,0,14072,0,38606,0,107852,0,301048,0,852975,
 0,2369097,0,6699177,0,19111621,0,54510099,0,
 155404674,0]