A001498 - OEIS

A001498 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	1
7	6
8	15
9	15
10	1
11	10
12	45
13	105
14	105
15	1
16	15
17	105
18	420
19	945
20	945
21	1
22	21
23	210
24	1260
25	4725
26	10395
27	10395
28	1
29	28
30	378
31	3150
32	17325
33	62370
34	135135
35	135135
36	1
37	36
38	630
39	6930
40	51975
41	270270
42	945945
43	2027025
44	2027025
45	1
46	45
47	990
48	13860
49	135135
50	945945
51	4729725
52	16216200
53	34459425
54	34459425

[1,1,1,1,3,3,1,6,15,15,1,10,45,105,105,1,15,105, 420,945,945,1,21,210,1260,4725,10395,10395,1,28, 378,3150,17325,62370,135135,135135,1,36,630,6930, 51975,270270,945945,2027025,2027025,1,45,990, 13860,135135,945945,4729725,16216200,34459425, 34459425]