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 A047334 #5 Jun 01 2010 03:00:00 %S A047334 0,1,2,3,5,6,7,8,9,10,12,13,14,15,16,17,19,20,21,22,23,24,26,27,28,29 %N A047334 Duplicate of A032775. %K A047334 dead %O A047334 1,3