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 A370374 #45 Nov 13 2024 16:39:10
%S A370374 2,2,0,0,5,0,7,4,4,9,9,6,6,1,5,4,9,8,2,8,0,9,2,6,4,1,7,0,4,2,7,7,3,4,
%T A370374 6,0,6,9,4,7,3,5,6,5,2,7,7,7,1,6,1,4,2,7,1,9,7,3,5,3,7,4,2,5,3,9,7,9,
%U A370374 6,6,9,6,4,1,7,6,3,3,9,8,4,3,0,5,2,1,9,3
%N A370374 Decimal expansion of 2*log(2) - 4*Catalan/Pi.
%D A370374 Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, 2003, Section 1.7.2, p. 55.
%H A370374 Sheldon Yang, <a href="https://dx.doi.org/10.1080/0020739X.1192.10715688">Some properties of Catalan's constant G</a>, Internat. J. Math. Ed. Sci. Tech. 23 (4) (1992) 549-556, L*(0).
%F A370374 Equals Sum_{n>=1} ((2n-1)!!/(2n)!!)^2 / (2*n).
%F A370374 Equals A016627 - A218387.
%F A370374 Equals Sum_{k>=1} binomial(2*k,k)^2/(k*2^(4*k+1)) (see Finch). - _Stefano Spezia_, Nov 13 2024
%e A370374 0.22005074499...
%p A370374 2*log(2)-4*Catalan/Pi ; evalf(%) ;
%t A370374 RealDigits[2*Log[2] - 4*Catalan/Pi, 10, 120][[1]] (* _Amiram Eldar_, Jun 10 2024 *)
%o A370374 (PARI) 2*log(2) - 4*Catalan/Pi \\ _Amiram Eldar_, Jun 10 2024
%Y A370374 Cf. A016627, A218387.
%K A370374 nonn,cons
%O A370374 0,1
%A A370374 _R. J. Mathar_, Jun 07 2024