A187248 - cp's OEIS frontend

A187248 Number of permutations of [n] having only cycles with at least 3 alternating runs (it is assumed that the smallest element of the cycle is in the first position).

n	a(n)
0	1
1	0
2	0
3	0
4	2
5	16
6	104
7	688
8	5116
9	44224
10	438560
11	4851136
12	58603544
13	764606016
14	10715043104
15	160692920256
16	2570016145680
17	43678554864128
18	786135111482112
19	14936420654180864
20	298733557232591136
21	6273502048592506112
22	138018105454095739008
23	3174423293668325353216

[1, 0, 0, 0, 2, 16, 104, 688, 5116, 44224, 438560, 4851136, 58603544, 764606016, 10715043104, 160692920256, 2570016145680, 43678554864128, 786135111482112, 14936420654180864, 298733557232591136, 6273502048592506112, 138018105454095739008, 3174423293668325353216]

cp's OEIS Frontend

A187248 Number of permutations of [n] having only cycles with at least 3 alternating runs (it is assumed that the smallest element of the cycle is in the first position).

Table of values

List of values