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 A031116 #4 Mar 30 2012 18:56:21 %S A031116 7,23,27,36,38,48,60,68,78,79,98,108,113,114,154,162,169,194,228,231, %T A031116 234,274,278,280,300,302,331,334,335,339,345,367,386,388,392,395,398, %U A031116 429,433,451,461,472,475,478,506,512,555,556 %N A031116 Position of n-th 4 in A031111. %K A031116 nonn %O A031116 1,1 %A A031116 _Clark Kimberling_