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 A112023 #3 Mar 30 2012 16:50:20 %S A112023 1000,72,5,25,7 %N A112023 A puzzle sequence, answer unknown. %D A112023 Joshua Zucker, Posting to Seq Fan mailing list, Nov 24 2005 %K A112023 nonn,unkn %O A112023 1,1 %A A112023 _N. J. A. Sloane_, Nov 24 2005