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 A214174 #47 Jun 22 2022 21:35:16
%S A214174 1,8,5,6,1,3,4,3,6,3,5,5,3,8,6,0,8,1,4,7,6,9,8,1,9,9,0,1,9,9,7,1,9,9,
%T A214174 8,5,6,0,9,4,3,0,4,5,9,1,3,1,2,9,3,2,0,5,4,0,7,6,0,1,9,1,9,3,9,1,1,2,
%U A214174 6,1,2,1,2,8,7,5,7,7,7,5,1,7,9,1,7,2,7
%N A214174 Decimal expansion of Integral_{x=0..oo} x/cosh(Pi*x) dx.
%C A214174 This sequence is between A020761 [Integral_{x=0..oo} x^0/cosh(Pi*x) dx] and A020821 [Integral_{x=0..oo} x^2/cosh(Pi*x) dx].
%H A214174 G. C. Greubel, <a href="/A214174/b214174.txt">Table of n, a(n) for n = 0..10000</a>
%F A214174 Equals A060294*A143233 = 2*C/Pi^2, where C is Catalan's constant (A006752).
%e A214174 0.1856134363553860814769819901997199856094304591312932054076019...
%t A214174 RealDigits[2 Catalan/Pi^2, 10, 90][[1]]
%o A214174 (PARI) default(realprecision, 100); 2*Catalan/Pi^2 \\ _G. C. Greubel_, Aug 25 2018
%o A214174 (Magma) SetDefaultRealField(RealField(100)); R:=RealField(); 2*Catalan(R)/Pi(R)^2; // _G. C. Greubel_, Aug 25 2018
%Y A214174 Cf. A006752, A020761, A020821, A060294, A143233.
%K A214174 nonn,cons
%O A214174 0,2
%A A214174 _Bruno Berselli_, Mar 20 2013