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Square root of A084243.
Reinhold Remmert, Classical topics in complex function theory, Vol. 172 of Graduate Texts in Mathematics, p. 12, Springer, 1997.
Table of n, a(n) for n=1..105.
Equals 1/A090986. [From R. J. Mathar, Mar 05 2009]
3.676077910374977720 = (1+1)*(1+1/4)*(1+1/9)*(1+1/16)*(1+1/25)*...
(PARI) sinh(Pi)/Pi \\ Charles R Greathouse IV, Dec 16 2013
Sequence in context: A228787 A245220 A165952 * A016616 A021276 A067753
Adjacent sequences: A156645 A156646 A156647 * A156649 A156650 A156651
R. J. Mathar, Feb 12 2009