Number of permutations in S_n avoiding {bar 1}5{bar 2}43 (i.e., every occurrence of 543 is contained in an occurrence of 15243).
A137552
Number of permutations in S_n avoiding {bar 1}5{bar 2}43 (i.e., every occurrence of 543 is contained in an occurrence of 15243).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =146a(7) =550a(8) =2289a(9) =10438a(10) =51691a(11) =275770a(12) =1574141a(13) =9559033a(14) =61455254a(15) =416572897
External references
- oeis: A137552