A279298 Number of permutations of [n] having exactly nine (possibly overlapping) doubledescents.

1, 22, 8417, 279850, 18342412, 685212762, 29029313611, 1061113063498, 39275632545209, 1393699927780248, 49383101195522106, 1732429335364441968, 60909095747242747307, 2146854079671345945398, 76207802610167861527865, 2728392333397142478341958

Offset: 11

Author

Alois P. Heinz, Dec 09 2016

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 11..459

Crossrefs

Column k=9 of A162975.