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 A275408 #27 Jul 16 2020 02:31:52
%S A275408 1,1,3,3,0,9,0,0,3,5,4,5,6,7,9,8,4,5,2,4,0,6,9,2,0,7,3,6,4,2,9,1,6,6,
%T A275408 7,0,2,5,4,2,9,6,5,3,6,6,9,3,0,9,4,8,8,9,6,0,4,6,5,0,4,1,3,6,9,8,5,1,
%U A275408 5,0,2,3,8,4,3,0,3,2,6,2,7,5,5,6,4,7,7
%N A275408 Decimal expansion of Pi/(4*log(2)).
%F A275408 Equals (Sum_{n>=0} (-1)^n/(2*n+1)) / (Sum_{n>=1} (-1)^(n+1)/n) = A003881 / A002162.
%F A275408 Equals Integral_{x=0..oo} 1/(2^x + 2^(-x)) dx. - _Amiram Eldar_, Jul 16 2020
%e A275408 1.133090035456798452406920736429166702542965366930948896046504136985...
%t A275408 A275408L[n_] := RealDigits[Pi/(4 Log[2]), 10, n][[1]]; A275408L[50] (* _JungHwan Min_, Jul 29 2016 *)
%o A275408 (PARI) Pi/(4*log(2)) \\ _Michel Marcus_, Jul 27 2016
%Y A275408 Cf. A002162, A003881, A185280 (Inverse).
%K A275408 nonn,cons
%O A275408 1,3
%A A275408 _Terry D. Grant_, Jul 26 2016
%E A275408 More digits from _Jon E. Schoenfield_, Mar 15 2018