This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A279296 #4 Dec 09 2016 15:27:01 %S A279296 1,18,2195,57980,2234121,62821766,1877987735,52129260840, %T A279296 1462714640951,40503784352590,1131481211125461,31802909031355052, %U A279296 905596491625548929,26146644212681105382,767446589270204991395,22921754812832515642328,697455004277912572544814 %N A279296 Number of permutations of [n] having exactly seven (possibly overlapping) doubledescents. %H A279296 Alois P. Heinz, <a href="/A279296/b279296.txt">Table of n, a(n) for n = 9..460</a> %Y A279296 Column k=7 of A162975. %K A279296 nonn %O A279296 9,2 %A A279296 _Alois P. Heinz_, Dec 09 2016