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 A169930 #11 Mar 26 2015 14:16:24 %S A169930 1,2,3,4,5,6,7,8,9,0,21,22,23,24,25,26,27,28,29,20,31,32,33,34,35,36 %N A169930 Duplicate of A048379. %K A169930 dead %O A169930 0,2