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

A279297

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

Terms

    a(0) =1a(1) =20a(2) =4280a(3) =127917a(4) =6402984a(5) =208910728a(6) =7440888001a(7) =237920318012

External references