A185786 - OEIS

A185786 as a simple table

n	a(n)
1	1
2	6
3	6
4	21
5	35
6	21
7	56
8	120
9	120
10	56
11	126
12	315
13	405
14	315
15	126
16	252
17	700
18	1050
19	1050
20	700
21	252
22	462
23	1386
24	2310
25	2695
26	2310
27	1386
28	462
29	792
30	2520
31	4536
32	5880
33	5880
34	4536
35	2520
36	792
37	1287
38	4290
39	8190
40	11466
41	12740
42	11466
43	8190
44	4290
45	1287
46	2002
47	6930
48	13860
49	20580
50	24696
51	24696
52	20580
53	13860
54	6930
55	2002
56	3003
57	10725
58	22275
59	34650

[1,6,6,21,35,21,56,120,120,56,126,315,405,315,126, 252,700,1050,1050,700,252,462,1386,2310,2695,2310, 1386,462,792,2520,4536,5880,5880,4536,2520,792, 1287,4290,8190,11466,12740,11466,8190,4290,1287, 2002,6930,13860,20580,24696,24696,20580,13860, 6930,2002,3003,10725,22275,34650]