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 A030735 #4 Mar 30 2012 18:56:19 %S A030735 1,5,7,21,50,51,52,142,166,219,243,252,255,261,299,327,330,331,337, %T A030735 340,374,376,381,384,427,430,476,479,524,528,531,586,589,628,639,647, %U A030735 650,696,702,704,710,713,777,780,849 %N A030735 s(n)=3, where s=A030727. %K A030735 nonn %O A030735 1,2 %A A030735 _Clark Kimberling_