A187250 - cp's OEIS frontend

A187250 Triangle read by rows: T(n,k) is the number of permutations of [n] having k cycles with at least 3 alternating runs (it is assumed that the smallest element of a cycle is in the first position), 0<=k<=floor(n/4).

n	a(n)
0	1
1	1
2	2
3	6
4	22
5	2
6	94
7	26
8	460
9	260
10	2532
11	2508
12	15420
13	24760
14	140
15	102620
16	254968
17	5292
18	739512
19	2760432
20	128856
21	5729192
22	31547344
23	2640264
24	47429896
25	381339368
26	50186136
27	46200
28	417429800
29	4879612808
30	926494712
31	3483480
32	3888426512
33	66107044176
34	17025751600
35	157068912

[1, 1, 2, 6, 22, 2, 94, 26, 460, 260, 2532, 2508, 15420, 24760, 140, 102620, 254968, 5292, 739512, 2760432, 128856, 5729192, 31547344, 2640264, 47429896, 381339368, 50186136, 46200, 417429800, 4879612808, 926494712, 3483480, 3888426512, 66107044176, 17025751600, 157068912]

cp's OEIS Frontend

A187250 Triangle read by rows: T(n,k) is the number of permutations of [n] having k cycles with at least 3 alternating runs (it is assumed that the smallest element of a cycle is in the first position), 0<=k<=floor(n/4).

Table of values

List of values