Number of permutations in S_n avoiding {bar 4}1253 (i.e., every occurrence of 1253 is contained in an occurrence of a 41253).

A137540

Number of permutations in S_n avoiding {bar 4}1253 (i.e., every occurrence of 1253 is contained in an occurrence of a 41253).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =104a(6) =533a(7) =3026a(8) =18744a(9) =125284a(10) =895936a(11) =6809075a(12) =54697741a(13) =462353643a(14) =4097020158a(15) =37936453443

External references