A349979 - cp's OEIS frontend

A349979 Irregular triangle read by rows: T(n,k) is the number of n-permutations whose second-longest cycle has length exactly k; n>=0, 0<=k<=floor(n/2).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	4
6	6
7	15
8	3
9	24
10	61
11	35
12	120
13	290
14	270
15	40
16	720
17	1646
18	1974
19	700
20	5040
21	11025
22	14707
23	8288
24	1260
25	40320
26	85345
27	117459
28	90272
29	29484
30	362880
31	749194
32	1023390
33	974720
34	446040
35	72576
36	3628800
37	7347374
38	9813210
39	10666480
40	6332040
41	2128896

[1, 1, 1, 1, 2, 4, 6, 15, 3, 24, 61, 35, 120, 290, 270, 40, 720, 1646, 1974, 700, 5040, 11025, 14707, 8288, 1260, 40320, 85345, 117459, 90272, 29484, 362880, 749194, 1023390, 974720, 446040, 72576, 3628800, 7347374, 9813210, 10666480, 6332040, 2128896]

cp's OEIS Frontend

A349979 Irregular triangle read by rows: T(n,k) is the number of n-permutations whose second-longest cycle has length exactly k; n>=0, 0<=k<=floor(n/2).

Table of values

List of values