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