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 A099404 #2 May 11 2007 03:00:00 %S A099404 6,4,3,21,2,15,13,12,11,10,9,8,72,7,63,6,56,53,51,5,46,44,42,41,4,38, %T A099404 36 %N A099404 Duplicate of A095156. %K A099404 dead %O A099404 1,1