A187252 - cp's OEIS frontend

A187252 Number of cycles with at least 3 alternating runs in all permutations of [n] (it is assumed that the smallest element of a cycle is in the first position).

n	a(n)
0	0
1	0
2	0
3	0
4	2
5	26
6	260
7	2508
8	25040
9	265552
10	3018144
11	36827872
12	481850240
13	6743052672
14	100629754112
15	1596624594688
16	26853667866624
17	477435143587840
18	8949520012611584
19	176443253945217024
20	3650510179312910336
21	79093615773747232768
22	1791150489194147512320

[0, 0, 0, 0, 2, 26, 260, 2508, 25040, 265552, 3018144, 36827872, 481850240, 6743052672, 100629754112, 1596624594688, 26853667866624, 477435143587840, 8949520012611584, 176443253945217024, 3650510179312910336, 79093615773747232768, 1791150489194147512320]

cp's OEIS Frontend

A187252 Number of cycles with at least 3 alternating runs in all permutations of [n] (it is assumed that the smallest element of a cycle is in the first position).

Table of values

List of values