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 A031086 #4 Mar 30 2012 18:56:20 %S A031086 1,2,3,4,5,6,7,8,9,11,1,15,17,19,21,23,25,27,14,31,2,35,37,39,41,43, %T A031086 45,16,34,51,3,55,57,59,61,63,18,36,54,71,4,75,77,79,81,20,38,56,74, %U A031086 91,5,95,97,99,22,40,58,76,94,111,6,115,117,24,42 %N A031086 a(n)=least k such that base 9 representation of n begins at s(k), where s=A031076. %K A031086 nonn %O A031086 1,2 %A A031086 _Clark Kimberling_