Number of permutations in S_n avoiding {bar 5}1243 (i.e., every occurrence of 1243 is contained in an occurrence of a 51243).
A137547
Number of permutations in S_n avoiding {bar 5}1243 (i.e., every occurrence of 1243 is contained in an occurrence of a 51243).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =104a(6) =535a(7) =3085a(8) =19846a(9) =142353a(10) =1138790a(11) =10150313a(12) =100489984a(13) =1099323551a(14) =13202175429a(15) =172831253945
External references
- oeis: A137547