A187245 - cp's OEIS frontend

A187245 Number of permutations of [n] having no cycle with 2 alternating runs (it is assumed that the smallest element of the cycle is in the first position).

n	a(n)
0	1
1	1
2	2
3	5
4	17
5	78
6	463
7	3315
8	27164
9	247975
10	2492539
11	27422698
12	328607417
13	4266367567
14	59686293284
15	895068242601
16	14320843215019
17	243467476610732
18	4382635181281015
19	83272415871044649
20	1665465961530365026
21	34974843092354081119
22	769445564105823722109

[1, 1, 2, 5, 17, 78, 463, 3315, 27164, 247975, 2492539, 27422698, 328607417, 4266367567, 59686293284, 895068242601, 14320843215019, 243467476610732, 4382635181281015, 83272415871044649, 1665465961530365026, 34974843092354081119, 769445564105823722109]

cp's OEIS Frontend

A187245 Number of permutations of [n] having no cycle with 2 alternating runs (it is assumed that the smallest element of the cycle is in the first position).

Table of values

List of values