Number of permutations of [n] having no cycle with 3 or more alternating runs (it is assumed that the smallest element of a cycle is in the first position).
A187251
Number of permutations of [n] having no cycle with 3 or more alternating runs (it is assumed that the smallest element of a cycle is in the first position).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =94a(6) =460a(7) =2532a(8) =15420a(9) =102620a(10) =739512a(11) =5729192a(12) =47429896a(13) =417429800a(14) =3888426512a(15) =38192416048a(16) =394239339792
External references
- oeis: A187251