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 A082337 #9 Feb 08 2012 12:59:39 %S A082337 0,1,2,3,4,5,7,6,8,9,10,11,12,13,17,18,16,14,15,21,19,20,22,23,24,25, %T A082337 26 %N A082337 Duplicate of A069775. %K A082337 dead %O A082337 0,3