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 A030710 #4 Mar 30 2012 18:56:19 %S A030710 1,7,3,4,16,6,29,9,38,30,14,39,20,51,84,28,152,37,82,124,83,49,177, %T A030710 101,64,276,123,81,146,99,173,409,357,174,121,203,314,145,237,452,238, %U A030710 172,562,274,202,506,312,450,313,236,687,272,686 %N A030710 a(n)=least k such that s(k)=n, where s=A030707. %K A030710 nonn %O A030710 1,2 %A A030710 _Clark Kimberling_