Number of permutations that avoid the generalized pattern 123-4.

A071076

Number of permutations that avoid the generalized pattern 123-4.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =108a(6) =598a(7) =3815a(8) =27532a(9) =221708a(10) =1970251a(11) =19150132a(12) =202064380a(13) =2300071071a(14) =28092017668a(15) =366425723926

External references