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 A031113 #4 Mar 30 2012 18:56:20 %S A031113 1,6,13,14,17,29,31,34,40,45,50,53,64,70,75,81,100,110,124,128,129, %T A031113 132,135,136,145,155,161,168,174,190,198,199,203,204,205,212,214,230, %U A031113 247,253,254,258,259,262,272,275,283,286,298,308 %N A031113 Position of n-th 1 in A031111. %K A031113 nonn %O A031113 1,2 %A A031113 _Clark Kimberling_