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 A047333 #3 May 11 2007 03:00:00 %S A047333 1,2,3,5,6,8,9,10,12,13,15,16,17,19,20,22,23,24,26,27,29,30,31,33,34 %N A047333 Duplicate of A032796. %K A047333 dead %O A047333 1,2