A349980 - cp's OEIS frontend

A349980 Irregular triangle read by rows: T(n,k) is the number of n-permutations whose second-shortest cycle has length exactly k; n >= 0, 0 <= k <= max(0,n-1).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	3
7	6
8	7
9	3
10	8
11	24
12	31
13	15
14	20
15	30
16	120
17	191
18	135
19	40
20	90
21	144
22	720
23	1331
24	945
25	280
26	420
27	504
28	840
29	5040
30	10655
31	7077
32	4480
33	1260
34	2688
35	3360
36	5760
37	40320
38	95887
39	64197
40	41552
41	11340
42	18144
43	20160
44	25920
45	45360
46	362880
47	958879
48	646965
49	395360
50	238140
51	72576
52	151200
53	172800
54	226800
55	403200

[1, 1, 1, 1, 2, 1, 3, 6, 7, 3, 8, 24, 31, 15, 20, 30, 120, 191, 135, 40, 90, 144, 720, 1331, 945, 280, 420, 504, 840, 5040, 10655, 7077, 4480, 1260, 2688, 3360, 5760, 40320, 95887, 64197, 41552, 11340, 18144, 20160, 25920, 45360, 362880, 958879, 646965, 395360, 238140, 72576, 151200, 172800, 226800, 403200]

cp's OEIS Frontend

A349980 Irregular triangle read by rows: T(n,k) is the number of n-permutations whose second-shortest cycle has length exactly k; n >= 0, 0 <= k <= max(0,n-1).

Table of values

List of values