A154653 - OEIS

A154653 as a simple table

n	a(n)
0	1
1	1
2	1
3	1
4	6
5	1
6	1
7	15
8	15
9	1
10	1
11	45
12	210
13	210
14	1
15	1
16	66
17	495
18	924
19	66
20	1
21	1
22	120
23	1820
24	8008
25	8008
26	1820
27	1
28	1
29	153
30	3060
31	18564
32	43758
33	18564
34	153
35	1
36	1
37	231
38	7315
39	74613
40	646646
41	646646
42	74613
43	7315
44	1
45	1
46	378
47	20475
48	376740
49	13123110
50	30421755
51	30421755
52	13123110
53	376740
54	1

[1,1,1,1,6,1,1,15,15,1,1,45,210,210,1,1,66,495, 924,66,1,1,120,1820,8008,8008,1820,1,1,153,3060, 18564,43758,18564,153,1,1,231,7315,74613,646646, 646646,74613,7315,1,1,378,20475,376740,13123110, 30421755,30421755,13123110,376740,1]