Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents.

A279296

Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents.

Terms

    a(0) =1a(1) =18a(2) =2195a(3) =57980a(4) =2234121a(5) =62821766a(6) =1877987735a(7) =52129260840

External references