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%I #15 Jul 21 2020 03:30:21
%S 8,2,4,3,6,0,6,3,5,3,5,0,0,6,4,0,7,3,4,2,4,3,2,5,3,9,3,9,0,7,0,8,1,7,
%T 8,5,8,2,6,8,8,8,0,5,0,3,5,5,0,7,4,0,0,5,7,8,7,5,3,9,6,5,5,8,2,0,3,3,
%U 0,5,1,0,5,9,7,1,0,7,8,0,4,3,1,6,3,8,8,2,6,0,0,2,8,1,8,3,3,2,1
%N Decimal expansion of sqrt(e)/2.
%H Ivan Panchenko, <a href="/A019775/b019775.txt">Table of n, a(n) for n = 0..1000</a>
%F From _Amiram Eldar_, Jul 21 2020: (Start)
%F Equals Sum_{k>=0} 1/(2^(k+1)*k!).
%F Equals Sum_{k>=0} 1/(2^k*(k-1)!).
%F Equals Sum_{k>=0} k/(2*k)!!.
%F Equals A019774/2. (End)
%e 0.82436063535006407342432539390708178582688805035507...
%t RealDigits[Sqrt[E]/2,10,120][[1]] (* _Harvey P. Dale_, Jun 18 2014 *)
%Y Cf. A019774.
%K nonn,cons
%O 0,1
%A _N. J. A. Sloane_.
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