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 A073903 #21 May 05 2015 21:04:51 %S A073903 11,1021,1201,2011,3001,10103,10211,10301,11003,12011,12101,13001, %T A073903 20021,20201,21011,21101 %N A073903 Duplicate of A069710. %K A073903 dead %O A073903 1,1 %A A073903 _Amarnath Murthy_, Aug 18 2002