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 A030574 #4 Mar 30 2012 18:56:18 %S A030574 1,2,3,4,5,17,7,1,11,13,15,29,10,21,2,25,27,41,12,24,35,3,39,53,14,26, %T A030574 38,49,4,5,16,28,40,52,63,173,69,17,119,137,155,68,7,8,91,94,97,71,9, %U A030574 20,1,143,161,74,11,32,128,146,164,77,13,44,131 %N A030574 a(n)=least k such that base 6 representation of n begins at s(k), where s=A030567. %K A030574 nonn %O A030574 1,2 %A A030574 _Clark Kimberling_