Number of permutations in S_n avoiding 345{bar 2}{bar 1} (i.e., every occurrence of 345 is contained in an occurrence of a 34521).
A137557
Number of permutations in S_n avoiding 345{bar 2}{bar 1} (i.e., every occurrence of 345 is contained in an occurrence of a 34521).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =150a(7) =617a(8) =3050a(9) =18059a(10) =125930a(11) =1013553a(12) =9246862a(13) =94226123a(14) =1059882190a(15) =13035332841
External references
- oeis: A137557