Number of permutations in S_n avoiding {bar 2}413{bar 5} (i.e., every occurrence of 413 is contained in an occurrence of a 24135).
A137551
Number of permutations in S_n avoiding {bar 2}413{bar 5} (i.e., every occurrence of 413 is contained in an occurrence of a 24135).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =144a(7) =525a(8) =2084a(9) =9005a(10) =42288a(11) =215111a(12) =1179738a(13) =6937765a(14) =43504598a(15) =289356385a(16) =2031636826a(17) =14995775647a(18) =115943399636a(19) =936138957225
External references
- oeis: A137551