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 A084118 #13 Jan 04 2021 21:40:12
%S A084118 0,4,1,3,3,7,2,1,1,3,3,18,9,15,1,13,3,1,1,1,4,3,1,3,1,1,1,1,3,8,18,2,
%T A084118 3,2,14,3,1,2,1,7,1,300,1,3,1,17,1,1,1,4,3,9,2,3,4,1,25,6,12,3,1,1,3,
%U A084118 4,2,6,28,2,11,2,3,1,2,3,18,9,1,1,3,2,22,165,8,5,13,7,1,6,1,2,3,5,1,14,6,1
%N A084118 Continued fraction expansion of Product_{k>=0} (1 - 1/(2^k+1)).
%C A084118 c/4 where c is the constant defined in A085011.
%F A084118 Product_{k>=0} (1 - 1/(2^k+1)) = 0.2097112208975537988549780538514871...
%o A084118 (PARI) contfrac(prod(k=0,1000,1-1./(2^k+1)))
%Y A084118 Cf. A085011.
%K A084118 cofr,nonn
%O A084118 0,2
%A A084118 _Benoit Cloitre_, Jun 19 2003