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 A081769 #5 Mar 30 2012 18:39:16 %S A081769 5,13,18,23,25,30,38,43,45,53,58,60,65,70,78,83,85,93,98,103,105,110, %T A081769 118,120,125,133,138,140,145,150,158,163,165,173,178,183,185,190,198, %U A081769 203,205,213,218,220,225,230,238,240,245,253,258,263,265,270,278,280 %N A081769 a(n)-th term of the continued fraction for sum(k>=0,1/2^(2^k)) is 2. %F A081769 a(n)=5*n + 0 or + 3 and it appears that a(n)=5*n+3*A073089(n+2) %e A081769 The continued fraction for sum(k>=0,1/2^(2^k)) is : 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1... hence a(1)=5 %Y A081769 Cf. A006466, A073089. %K A081769 easy,nonn %O A081769 1,1 %A A081769 _Benoit Cloitre_, Apr 09 2003