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 A344505 #12 May 22 2021 04:31:46
%S A344505 9,9,6,2,7,2,0,7,6,2,2,0,7,4,9,9,4,4,2,6,4,6,9,0,5,8,0,0,1,2,5,3,6,7,
%T A344505 1,1,8,9,6,8,9,9,1,9,0,8,0,4,5,8,7,6,1,4,3,6,2,6,1,2,4,1,5,9,7,8,5,4,
%U A344505 1,2,9,8,9,8,2,8,2,1,7,1,7,6,8,5,2,8
%N A344505 Decimal expansion of (exp(2*Pi) - 1) / (exp(2*Pi) + 1).
%F A344505 Equals tanh(Pi).
%F A344505 Equals 1 / A175316.
%F A344505 Equals A175315 / A175314.
%F A344505 Equals 1 - 2/(1 + (Sum_{k>=0} 1/k!)^tau), where tau = 2*Pi = A019692.
%e A344505 Approximate 0.9962720762207499442646905800...
%e A344505 Approximate tau/(2 + tau^2/(6 + tau^2/(10 + tau^2/(14 + tau^2/(18 + tau^2/(22 + tau^2/(26 + tau^2/(30 + ...)))))))), where tau = 2*Pi.
%p A344505 Digits := 100: tau := 2*Pi: (exp(tau) - 1)/(exp(tau) + 1):
%p A344505 evalf(%)*10^86: ListTools:-Reverse(convert(floor(%), base, 10));
%t A344505 RealDigits[Tanh[Pi], 10, 100][[1]] (* _Amiram Eldar_, May 22 2021 *)
%Y A344505 Cf. A019692, A175314, A175315, A175316.
%K A344505 nonn,cons
%O A344505 0,1
%A A344505 _Peter Luschny_, May 22 2021