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 A107688 #3 Mar 30 2012 18:50:50 %S A107688 1,1,1,1,1,2,1,1,1,1,4,1,1,1,1,1,1,2,3,1,4,1,1,1,1,1,1,2,1,1,1,1,4,3, %T A107688 1,1,1,2,3,1,4,1,1,1,1,1,1,2,1,1,1,1,4,1,1,1,1,1,1,2,3,1,4,3,1,1,1,2, %U A107688 1,1,1,1,4,3,1,1,1,2,3,1,4,1,1,1,1,1,1,2,1,1,1,1,4,1,1,1,1,1,1,2,3,1,4,1,1 %N A107688 A107686(n+1) - A107686(n). %C A107688 a(n) <= 4. %K A107688 nonn %O A107688 0,6 %A A107688 _Reinhard Zumkeller_, May 20 2005