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A279298
Number of permutations of [n] having exactly nine (possibly overlapping) doubledescents.
2
1, 22, 8417, 279850, 18342412, 685212762, 29029313611, 1061113063498, 39275632545209, 1393699927780248, 49383101195522106, 1732429335364441968, 60909095747242747307, 2146854079671345945398, 76207802610167861527865, 2728392333397142478341958
OFFSET
11,2
LINKS
CROSSREFS
Column k=9 of A162975.
Sequence in context: A110802 A200460 A202054 * A235389 A267491 A013727
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 09 2016
STATUS
approved