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 A038012 #3 Mar 30 2012 17:37:06 %S A038012 3730,5090,10030,9090,2880,10080,6800,2830,1070,3790,3150,10890,90, %T A038012 2100,630,420,770,850,770,6160,6030,2160,2930,4630,570,3210,5580,1850, %U A038012 5800,2100,4830,2340,810,1040,2740,210,780,3840,2310 %N A038012 Differences of A038011. %K A038012 nonn,base %O A038012 1,1 %A A038012 _Christian G. Bower_