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 A030611 #4 Mar 30 2012 18:56:19 %S A030611 1,2,3,12,4,22,38,1,8,26,43,50,7,6,2,30,17,237,14,35,9,70,3,19,12,27, %T A030611 34,33,31,112,4,29,56,11,44,247,201,22,387,103,634,246,134,38,97,135, %U A030611 42,49,293,5,1,125,171,308,13,98,8,193,65,212,95 %N A030611 a(n)=least k such that the base 6 representation of n begins at s(k), where s=A030604. %K A030611 nonn %O A030611 1,2 %A A030611 _Clark Kimberling_