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 A084129 #15 Jan 04 2021 21:40:34
%S A084129 0,1,5,4,1,6,1,8,13,4,1,1,8,1,1,3,2,13,1,3,2,3,4,2,3,2,14,2,73,1,2,1,
%T A084129 58,14,1,1,4,75,5,73,1,1,2,1,2,1,1,1,1,6,20,1,5,1,1,5,1,1,2,1,1,3,14,
%U A084129 1,8,1,1,1,27,1,46,1,3,5,73,2,2,1,1,3,1,2,5,3,1,40,1,1,7,1,2,3,3,31,2,12,3,1
%N A084129 Continued fraction expansion of 4*Product_{k>=0} (1 - 1/(2^k+1)).
%F A084129 4*Product_{k>=0} (1 - 1/(2^k+1)) = 0.838844883590215195...
%o A084129 (PARI) contfrac(4*prod(k=0,1000,1-1./(2^k+1)))
%Y A084129 Cf. A085011.
%K A084129 cofr,nonn
%O A084129 0,3
%A A084129 _Benoit Cloitre_, Jun 19 2003