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From Amiram Eldar, Jul 08 2023: (Start)
Equals Product_{n>=1} (e / (1 + 1/(n-1/2))^n).
Equals Product_{n>=1} (e * (1 - 1/(n+1/2))^n). (End)
RealDigits[Sqrt[2/E], 10, 120][[1]] (* Amiram Eldar, Jul 08 2023 *)
R. J. Mathar, <a href="http://arxiv.org/abs/physics/9907051">Orthogonal linear combinations of Gaussian Type Orbitals</a>, arXiv:physics/9907051, [physics.chem-ph], 1999-2009, Section VII.
Cf. A001113.
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(PARI) sqrt(2/exp(1)) \\ Charles R Greathouse IV, Apr 16 2014
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