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 A124393 #8 Mar 30 2012 17:26:58 %S A124393 3,14759,15449,26089 %N A124393 Numbers whose shortest addition chains unavoidably contain 3. %D A124393 For a comprehensive list of references see A003313. %K A124393 nonn,more,hard %O A124393 1,1 %A A124393 _Max Alekseyev_, Dec 16 2006