A279296 Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents.

1, 18, 2195, 57980, 2234121, 62821766, 1877987735, 52129260840, 1462714640951, 40503784352590, 1131481211125461, 31802909031355052, 905596491625548929, 26146644212681105382, 767446589270204991395, 22921754812832515642328, 697455004277912572544814

Offset: 9

Author

Alois P. Heinz, Dec 09 2016

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 9..460

Crossrefs

Column k=7 of A162975.