A114320 - cp's OEIS frontend

A114320 Triangle T(n,k) = number of permutations of n elements with k 2-cycles.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	15
7	6
8	3
9	75
10	30
11	15
12	435
13	225
14	45
15	15
16	3045
17	1575
18	315
19	105
20	24465
21	12180
22	3150
23	420
24	105
25	220185
26	109620
27	28350
28	3780
29	945
30	2200905
31	1100925
32	274050
33	47250
34	4725
35	945
36	24209955
37	12110175
38	3014550
39	519750
40	51975
41	10395
42	290529855

[1, 1, 1, 1, 3, 3, 15, 6, 3, 75, 30, 15, 435, 225, 45, 15, 3045, 1575, 315, 105, 24465, 12180, 3150, 420, 105, 220185, 109620, 28350, 3780, 945, 2200905, 1100925, 274050, 47250, 4725, 945, 24209955, 12110175, 3014550, 519750, 51975, 10395, 290529855]

cp's OEIS Frontend

A114320 Triangle T(n,k) = number of permutations of n elements with k 2-cycles.

Table of values

List of values