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 A073088 #10 Oct 13 2019 18:07:50
%S A073088 0,1,5,7,11,15,21,25,27,31,37,39,43,49,53,57,59,63,69,71,75,79,85,89,
%T A073088 91,97,101,103,107,113,117,121,123,127,133,135,139,143,149,153,155,
%U A073088 159,165,167,171,177,181,185,187,193,197,199,203,207,213,217,219,225,229
%N A073088 Sum of first n terms of the simple continued fraction of Sum_{k>=0} 1/2^(2^k) (cf. A007400).
%F A073088 a(n) ~ 4n and a(n) < 4n.
%e A073088 The first 9 terms are 0, 1, 4, 2, 4, 4, 6, 4, 2, hence a(9)= 0 + 1 + 4 + 2 + 4 + 4 + 6 + 4 + 2 = 27.
%Y A073088 Cf. A007400.
%K A073088 easy,nonn
%O A073088 1,3
%A A073088 _Benoit Cloitre_, Aug 18 2002