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 A136434 #19 May 21 2016 13:40:28 %S A136434 0,-2,2,18,52,110,198,322,488,702,970,1298,1692,2158 %N A136434 Duplicate of A121670. %K A136434 dead %O A136434 0,2