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%I #4 Dec 09 2016 15:50:14
%S 1,22,8417,279850,18342412,685212762,29029313611,1061113063498,
%T 39275632545209,1393699927780248,49383101195522106,
%U 1732429335364441968,60909095747242747307,2146854079671345945398,76207802610167861527865,2728392333397142478341958
%N Number of permutations of [n] having exactly nine (possibly overlapping) doubledescents.
%H Alois P. Heinz, <a href="/A279298/b279298.txt">Table of n, a(n) for n = 11..459</a>
%Y Column k=9 of A162975.
%K nonn
%O 11,2
%A _Alois P. Heinz_, Dec 09 2016
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