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

11,2

Links

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

Crossrefs

Column k=9 of A162975.

Sequence in context: A110802 A200460 A202054 * A235389 A267491 A013727

Adjacent sequences: A279295 A279296 A279297 * A279299 A279300 A279301

Keyword

nonn

Author

Alois P. Heinz, Dec 09 2016

Status

approved