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 A081773 #5 Mar 30 2012 18:39:16 %S A081773 1,4,1,4,5,4,1,4,4,1,4,4,1,3,1,4,4,1,4,5,4,1,4,4,1,3,1,4,5,4,1,4,4,1, %T A081773 3,1,4,4,1,4,4,1,4,5,4,1,4,4,1,3,1,4,5,4,1,4,4,1,4,4,1,3,1,4,4,1,4,5, %U A081773 4,1,3,1,4,4,1,4,5,4,1,4,4,1,3,1,4,4,1,4,4,1,4,5,4,1,4,4,1,3,1,4,5,4,1,4,4 %N A081773 Continued fraction for sum(k>=0,1/5^(2^k-1)). %C A081773 Contains only elements 1<=a(n)<=5 ( but 2 never occurs) %Y A081773 Cf. A004200. %K A081773 cofr,nonn %O A081773 1,2 %A A081773 _Benoit Cloitre_, Apr 10 2003