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 A112026 #3 Mar 30 2012 16:50:20 %S A112026 30,28,32,38,40,42,46,52,60,60,64,68 %N A112026 A puzzle sequence, answer unknown. %D A112026 Joshua Zucker, Posting to Seq Fan mailing list, Nov 24 2005 %K A112026 nonn,unkn %O A112026 1,1 %A A112026 _N. J. A. Sloane_, Nov 24 2005