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 A097846 #4 Mar 30 2012 18:55:34 %S A097846 0,0,0,0,0,0,0,0,0,0,-99,0,99,198,297,396,495,594,693,792,-198,-99,0, %T A097846 99,198,297,396,495,594,693,-297 %N A097846 Differences between A097598 and A045918. %Y A097846 Cf. A045918, A047842, A097598, A097599, A097601. %K A097846 easy,sign,base %O A097846 0,11 %A A097846 _Odimar Fabeny_, Aug 31 2004