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 A179967 #11 Dec 01 2018 19:35:09 %S A179967 362880,5296790,88422296,1634227958,32096768008,649347224736 %N A179967 Number of permutations of 1..2*n+9 with no adjacent elements within n in value. %K A179967 nonn,more %O A179967 0,1 %A A179967 _R. H. Hardin_, Aug 03 2010 %E A179967 a(0)=362880 prepended by _Seiichi Manyama_, Dec 01 2018