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 A085921 #3 May 11 2007 03:00:00 %S A085921 1,2,3,5,6,8,10,11,14,16,17,18,19,21,22,24,25,29,30,32,33,34,35,37 %N A085921 Duplicate of A005243. %K A085921 dead %O A085921 1,2