A187249 - cp's OEIS frontend

A187249 Number of cycles with at most 2 alternating runs in all permutations of [n] (it is assumed that the smallest element of the cycle is in the first position).

n	a(n)
0	0
1	1
2	3
3	11
4	48
5	248
6	1504
7	10560
8	84544
9	761024
10	7610496
11	83715968
12	1004592640
13	13059706368
14	182835893248
15	2742538406912
16	43880614526976
17	745970446991360
18	13427468045910016
19	255121892872421376
20	5102437857448689664
21	107151195006423007232
22	2357326290141307207680

[0, 1, 3, 11, 48, 248, 1504, 10560, 84544, 761024, 7610496, 83715968, 1004592640, 13059706368, 182835893248, 2742538406912, 43880614526976, 745970446991360, 13427468045910016, 255121892872421376, 5102437857448689664, 107151195006423007232, 2357326290141307207680]

cp's OEIS Frontend

A187249 Number of cycles with at most 2 alternating runs in all permutations of [n] (it is assumed that the smallest element of the cycle is in the first position).

Table of values

List of values