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 A292820 #5 Mar 13 2018 12:40:28
%S A292820 1,0,4,5,2,5,0,2,1,4,3,5,4,7,1,1,9,4,2,5,4,7,5,9,5,0,1,2,2,0,3,5,6,2,
%T A292820 0,6,8,0,0,3,4,2,4,7,8,2,1,5,5,5,8,6,9,1,5,5,0,0,5,2,0,9,8,5,2,5,7,1,
%U A292820 1,7,5,7,9,3,9,6,9,6,0,3,2,7,9,0,4,0,8,1,7,0,5,6,2,0,9,7,6,8,2,9,3,9,0,9,6
%N A292820 Decimal expansion of Product_{k>=1} (1 + exp(-Pi*k)).
%F A292820 Equals exp(Pi/24) / 2^(1/8).
%F A292820 Equals A259149 / A259148.
%e A292820 1.045250214354711942547595012203562068003424782155586915500520985257117...
%t A292820 RealDigits[E^(Pi/24) / 2^(1/8), 10, 120][[1]]
%t A292820 RealDigits[QPochhammer[-1, E^(-Pi)]/2, 10, 120][[1]]
%o A292820 (PARI) exp(Pi/24)/sqrtn(2,8) \\ _Charles R Greathouse IV_, Mar 13 2018
%Y A292820 Cf. A259148, A292824, A292828, A292819, A292821, A292822.
%K A292820 nonn,cons
%O A292820 1,3
%A A292820 _Vaclav Kotesovec_, Sep 24 2017