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 A072763 #4 Sep 29 2006 03:00:00 %S A072763 0,1,2,3,4,5,6,7,8,9,10,11,12,13,41,51,16,17,81,91,20,12,22,32,42,52, %T A072763 62,72,82,92,30,13,32 %N A072763 Duplicate of A057846. %K A072763 dead %O A072763 1,3