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 A030730 #4 Mar 30 2012 18:56:19 %S A030730 2,4,1,12,8,10,13,18,16,25,34,23,44,182,32,58,73,43,109,129,56,151, %T A030730 152,71,202,176,88,204,203,107,233,127,268,149,201,488,173,306,542, %U A030730 231,200,266,487,230,390,724,660,304,437,265,485,345 %N A030730 Least k such that s(k)=n, where s=A030727. %K A030730 nonn %O A030730 1,1 %A A030730 _Clark Kimberling_