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 A072267 #3 May 11 2007 03:00:00 %S A072267 0,0,1,1,3,1,4,6,7,4,8,8,13,10,8,12,18,20,27,28,26,21,29,33,37,31,37, %T A072267 37 %N A072267 Duplicate of A024934. %K A072267 dead %O A072267 2,5