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 A140072 #5 Oct 13 2013 08:43:45 %S A140072 0,3,6,4,3,9,8,12,1,7,14,12,6,13,12,9,2,4,18,21,3,21,19,18,14,6,16,24, %T A140072 23,21,7,27,24,28,6,18,21,17,29,27,9,32,33,2,24,34,27,23,3,36,14,9,16, %U A140072 33,32,6,38,37,39,22,1,7,27,21,11,13,26,41,42,36,12,43,33,9,37,18,36,46 %N A140072 Values of x in A033205. %Y A140072 Cf. A033205, A140073. %K A140072 nonn %O A140072 1,2 %A A140072 _Zak Seidov_, May 05 2008