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%I #12 Nov 25 2020 06:44:32
%S 1,4,6,5,0,5,2,3,8,3,3,3,6,6,3,4,8,7,7,6,0,9,1,7,9,3,7,4,1,1,2,6,5,1,
%T 0,0,7,8,1,9,9,3,4,2,6,4,1,6,7,3,4,0,8,7,1,8,3,9,5,9,0,9,1,2,3,2,5,3,
%U 9,7,3,8,5,9,5,3,6,8,7,2,1,6,5,9,9,2,8,8,7,4,2,8,7,1,0,7,5,8,6,0,0,1,9,5,1,8,7,3,4,1,8,3,0,4,3,1,5,6,9,8
%N Decimal expansion of 2*sinh(Pi/2)/Pi.
%F Equals Product_{k>=1} (1 + 1/(4*k^2)).
%F Equals Product_{k>=1} (1 + 1/A016742(k)).
%F Equals binomial(0, i/2), where i is the imaginary unit. - _Amiram Eldar_, Nov 25 2020
%e 1.465052383336634877609179374112651007819934264167...
%t RealDigits[2 Sinh[Pi/2]/Pi, 10, 120][[1]]
%o (PARI) 2*sinh(Pi/2)/Pi \\ _Michel Marcus_, Jun 20 2019
%Y Cf. A016742, A060294, A156648, A308715.
%K nonn,cons
%O 1,2
%A _Ilya Gutkovskiy_, Jun 19 2019
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