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 A038006 #3 Mar 30 2012 17:37:06 %S A038006 12,36,24,36,12,20,4,48,36,20,4,60,6,22,80,32,10,18,52,8,12,36,24,48, %T A038006 12,60,24,24,12,48,144,16,8,32,20,8,24,30,30,6,22,20,60,24,18,66,12, %U A038006 12,8,52,8,10,38,4,56,4,28,2,18,12,48,18,2,4,126,42,6,12,30 %N A038006 Differences of A038005. %K A038006 nonn %O A038006 1,1 %A A038006 _Christian G. Bower_