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 A023492 #4 May 11 2007 03:00:00 %S A023492 3,8,10,15,20,28,41,60,90,138,215,339,540,863,1385,2229,3594,5802 %N A023492 Duplicate of A022801. %K A023492 dead %O A023492 0,1