Number of permutations in S_n avoiding 5{bar 1}{bar 2}43 (i.e., every occurrence of 543 is contained in an occurrence of a 51243).
A137549
Number of permutations in S_n avoiding 5{bar 1}{bar 2}43 (i.e., every occurrence of 543 is contained in an occurrence of a 51243).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =143a(7) =511a(8) =1950a(9) =7903a(10) =33848a(11) =152529a(12) =720466a(13) =3555715a(14) =18285538a(15) =97752779a(16) =542107657a(17) =3112916651a(18) =18477588573a(19) =113203102619a(20) =714836382820
External references
- oeis: A137549