Number of permutations in S_n avoiding 1{bar 4}235 (i.e., every occurrence of 1235 is contained in an occurrence of a 14235).
A137535
Number of permutations in S_n avoiding 1{bar 4}235 (i.e., every occurrence of 1235 is contained in an occurrence of a 14235).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =104a(6) =531a(7) =2977a(8) =17980a(9) =115408a(10) =779418a(11) =5496355a(12) =40229830a(13) =304165473a(14) =2366281302a(15) =18880731580
External references
- oeis: A137535