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 A097599 #4 Mar 30 2012 18:55:34 %S A097599 0,0,0,0,0,0,0,0,0,0,0,0,99,198,297,396,495,594,693,792,0,0,0,99,198, %T A097599 297,396,495,594,693,0 %N A097599 Differences between A097598 and A047842. %Y A097599 Cf. A045918, A047842. %K A097599 easy,nonn,base %O A097599 0,13 %A A097599 _Odimar Fabeny_, Aug 29 2004