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 A140073 #2 Mar 30 2012 17:26:27 %S A140073 1,2,1,3,4,2,3,1,6,6,3,5,7,6,7,8,9,9,5,2,10,4,6,7,9,11,9,5,6,8,12,4,7, %T A140073 3,13,11,10,12,6,8,14,3,2,15,11,3,10,12,16,1,15,16,15,8,9,17,3,6,4,15, %U A140073 18,18,14,16,18,18,15,6,5,11,19,6,14,20,12,19,13,3,21,21,15,1,9,19,6,20,9 %N A140073 Values of y in A033205. %Y A140073 Cf. A033205, A140072. %K A140073 nonn %O A140073 1,2 %A A140073 _Zak Seidov_, May 05 2008