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0,1
C. C. Clawson, The Beauty and Magic of Numbers. New York: Plenum Press (1996): 210.
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Index to sequences related to the Gamma function
(1/2)! = Gamma(3/2) = sqrt(Pi)/2. - Benoit Cloitre, Apr 24 2003
Equals integral_{0, infinity} exp(-x^2) dx, or integral_{0, infinity} exp(-(x - 1/x)^2) dx, or also integral_{0, 1} sqrt(log(1/x)) dx. [Jean-François Alcover, Mar 28 2013]
Equals sqrt(A003881). - Michel Marcus, Aug 31 2014
sqrt(Pi)/2 = 0.886226925452758013649...
RealDigits[Sqrt[Pi]/2, 10, 100][[1]] (* Alonso del Arte, Aug 15 2012 *)
Cf. A003881.
Sequence in context: A153619 A202497 A195708 * A140976 A253270 A021057
Adjacent sequences: A019701 A019702 A019703 * A019705 A019706 A019707
nonn,cons
N. J. A. Sloane.
approved