Number of permutations of length n with 4 consecutive ascending pairs.

A001260

Number of permutations of length n with 4 consecutive ascending pairs.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =5a(6) =45a(7) =385a(8) =3710a(9) =38934a(10) =444990a(11) =5506710a(12) =73422855a(13) =1049946755a(14) =16035550531a(15) =260577696015

External references