A133722 - OEIS

A133722 as a simple table

n	a(n)
1	0
2	0
3	1
4	1
5	1
6	1
7	7
8	3
9	1
10	25
11	6
12	1
13	65
14	10
15	1
16	140
17	15
18	1
19	266
20	21
21	1
22	462
23	28
24	1
25	750
26	36
27	1
28	1155
29	45
30	1
31	1705
32	55
33	1
34	2431
35	66
36	1
37	3367
38	78
39	1
40	4550
41	91
42	1
43	6020
44	105
45	1
46	7820
47	120
48	1
49	9996
50	136
51	1
52	12597
53	153
54	1
55	15675

[0,0,1,1,1,1,7,3,1,25,6,1,65,10,1,140,15,1,266,21, 1,462,28,1,750,36,1,1155,45,1,1705,55,1,2431,66,1, 3367,78,1,4550,91,1,6020,105,1,7820,120,1,9996, 136,1,12597,153,1,15675]