A085880 - OEIS

A085880 as a simple table

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	2
6	5
7	15
8	15
9	5
10	14
11	56
12	84
13	56
14	14
15	42
16	210
17	420
18	420
19	210
20	42
21	132
22	792
23	1980
24	2640
25	1980
26	792
27	132
28	429
29	3003
30	9009
31	15015
32	15015
33	9009
34	3003
35	429
36	1430
37	11440
38	40040
39	80080
40	100100
41	80080
42	40040
43	11440
44	1430
45	4862
46	43758
47	175032
48	408408
49	612612
50	612612
51	408408
52	175032
53	43758
54	4862

[1,1,1,2,4,2,5,15,15,5,14,56,84,56,14,42,210,420, 420,210,42,132,792,1980,2640,1980,792,132,429, 3003,9009,15015,15015,9009,3003,429,1430,11440, 40040,80080,100100,80080,40040,11440,1430,4862, 43758,175032,408408,612612,612612,408408,175032, 43758,4862]