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

A279298

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

Terms

    a(0) =1a(1) =22a(2) =8417a(3) =279850a(4) =18342412a(5) =685212762a(6) =29029313611

External references