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A279296
Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents.
2
1, 18, 2195, 57980, 2234121, 62821766, 1877987735, 52129260840, 1462714640951, 40503784352590, 1131481211125461, 31802909031355052, 905596491625548929, 26146644212681105382, 767446589270204991395, 22921754812832515642328, 697455004277912572544814
OFFSET
9,2
LINKS
CROSSREFS
Column k=7 of A162975.
Sequence in context: A276017 A178630 A136834 * A327266 A299696 A282830
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 09 2016
STATUS
approved