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 A063976 #3 May 11 2007 03:00:00 %S A063976 2,7,11,13,15,16,19,21,22,23,25,27,29,31,34,35,37,39,41,43,45,46,47,49 %N A063976 Duplicate of A064000. %K A063976 dead %O A063976 1,1