A390042 - OEIS

A390042 as a simple table

n	a(n)
0	1
1	0
2	0
3	4
4	0
5	0
6	10
7	0
8	0
9	20
10	0
11	0
12	35
13	1
14	0
15	56
16	8
17	0
18	84
19	36
20	0
21	120
22	120
23	0
24	165
25	330
26	1
27	220
28	792
29	12
30	286
31	1716
32	78
33	364
34	3432
35	364
36	455
37	6435
38	1365
39	561
40	11440
41	4368
42	696
43	19448
44	12376
45	952
46	31824
47	31824
48	1785
49	50388
50	75582
51	5016
52	77521
53	167960
54	16834
55	116300

[1,0,0,4,0,0,10,0,0,20,0,0,35,1,0,56,8,0,84,36,0, 120,120,0,165,330,1,220,792,12,286,1716,78,364, 3432,364,455,6435,1365,561,11440,4368,696,19448, 12376,952,31824,31824,1785,50388,75582,5016,77521, 167960,16834,116300]