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 A030555 #4 Mar 30 2012 18:56:18 %S A030555 1,2,3,4,5,6,8,1,12,14,16,18,11,22,2,26,28,30,13,25,36,3,40,42,15,27, %T A030555 39,50,4,54,5,17,29,41,53,66,6,72,75,78,81,71,8,9,93,96,99,102,10,21, %U A030555 1,114,117,120,12,33,129,132,135,138,14,45,147,150 %N A030555 a(n)=least k such that base 6 representation of n begins at s(k), where s=A030548. %K A030555 nonn %O A030555 1,2 %A A030555 _Clark Kimberling_