A202941 - cp's OEIS frontend

A202941 For n>=0, let n!^(2)=A202367(n+1) and, for 0<=m<=n, C^(2)(n,m)=n!^(2)/(m!^(2)*(n-m)!^(2)). The sequence gives triangle of numbers C^(2)(n,m) with rows of length n+1.

n	a(n)
0	1
1	1
2	1
3	1
4	10
5	1
6	1
7	21
8	21
9	1
10	1
11	20
12	42
13	20
14	1
15	1
16	11
17	22
18	22
19	11
20	1
21	1
22	2730
23	3003
24	2860
25	3003
26	2730
27	1
28	1
29	1
30	273
31	143
32	143
33	273
34	1
35	1

[1, 1, 1, 1, 10, 1, 1, 21, 21, 1, 1, 20, 42, 20, 1, 1, 11, 22, 22, 11, 1, 1, 2730, 3003, 2860, 3003, 2730, 1, 1, 1, 273, 143, 143, 273, 1, 1]