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 A081772 #5 Mar 30 2012 18:39:16 %S A081772 1,3,1,3,4,3,1,3,3,1,3,3,1,2,1,3,3,1,3,4,3,1,3,3,1,2,1,3,4,3,1,3,3,1, %T A081772 2,1,3,3,1,3,3,1,3,4,3,1,3,3,1,2,1,3,4,3,1,3,3,1,3,3,1,2,1,3,3,1,3,4, %U A081772 3,1,2,1,3,3,1,3,4,3,1,3,3,1,2,1,3,3,1,3,3,1,3,4,3,1,3,3,1,2,1,3,4,3,1,3,3 %N A081772 Continued fraction for sum(k>=0,1/4^(2^k-1)). %C A081772 Contains only elements 1<=a(n)<=4 %Y A081772 Cf. A004200, A006464. %K A081772 cofr,nonn %O A081772 1,2 %A A081772 _Benoit Cloitre_, Apr 10 2003