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 A031311 #4 Mar 30 2012 18:56:23 %S A031311 8,7,6,5,4,3,2,1,11,8,166,147,127,107,87,67,47,27,150,148,7,144,125, %T A031311 105,85,65,45,25,130,128,126,6,122,103,83,63,43,23,110,108,106,104,5, %U A031311 100,81,61,41,21,90,88,86,84,82,4,78,59,39,19,70,68 %N A031311 a(n)=least k such that base 10 representation of n begins at s(k), where s=A031310. %K A031311 nonn %O A031311 1,1 %A A031311 _Clark Kimberling_