A157018 - cp's OEIS frontend

A157018 Triangle T(n,k) read by rows: number of k-lists (ordered k-sets) of disjoint 2-subsets of an n-set, n>1, 0

n	a(n)
2	1
3	3
4	6
5	6
6	10
7	30
8	15
9	90
10	90
11	21
12	210
13	630
14	28
15	420
16	2520
17	2520
18	36
19	756
20	7560
21	22680
22	45
23	1260
24	18900
25	113400
26	113400
27	55
28	1980
29	41580
30	415800
31	1247400
32	66
33	2970
34	83160
35	1247400
36	7484400
37	7484400
38	78
39	4290
40	154440
41	3243240
42	32432400
43	97297200

[1, 3, 6, 6, 10, 30, 15, 90, 90, 21, 210, 630, 28, 420, 2520, 2520, 36, 756, 7560, 22680, 45, 1260, 18900, 113400, 113400, 55, 1980, 41580, 415800, 1247400, 66, 2970, 83160, 1247400, 7484400, 7484400, 78, 4290, 154440, 3243240, 32432400, 97297200]

cp's OEIS Frontend

A157018 Triangle T(n,k) read by rows: number of k-lists (ordered k-sets) of disjoint 2-subsets of an n-set, n>1, 0

Table of values

List of values