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 A117912 #2 Mar 30 2012 17:36:43 %S A117912 2,4,6,8,24,48,248,264,624,648,824,864 %N A117912 Lynch-Bell numbers whose digits are all even. %Y A117912 Cf. A115569, A117913 (same but digits are all odd). %K A117912 base,easy,fini,full,nonn %O A117912 1,1 %A A117912 _Rick L. Shepherd_, Apr 02 2006