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 A222391 Decimal expansion of e^2/sqrt(Pi). 4
 4, 1, 6, 8, 8, 2, 8, 4, 8, 3, 2, 6, 6, 6, 9, 2, 2, 3, 0, 4, 2, 1, 3, 0, 3, 9, 0, 7, 7, 5, 2, 3, 1, 0, 2, 6, 0, 3, 8, 6, 6, 6, 4, 6, 8, 1, 1, 4, 8, 4, 9, 9, 6, 3, 7, 8, 3, 0, 0, 0, 8, 9, 5, 4, 6, 2, 4, 0, 4, 3, 2, 2, 7, 2, 0, 1, 5, 3, 6, 0, 9, 2, 7, 9, 8, 1, 9 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS G. C. Greubel, Table of n, a(n) for n = 1..5000 FORMULA Equals A072334*A087197. Equals decimal expansion of Sum_{n >= 1} 1/(Gamma(n/2)*Gamma((n+1)/2)). EXAMPLE 4.1688284832666922304213039077523102603866646811484996378300089546240432... MAPLE Digits:=100: evalf(exp(1)^2/sqrt(Pi)); # Wesley Ivan Hurt, Jan 09 2017 MATHEMATICA RealDigits[E^2/Sqrt[Pi], 10, 90][[1]] PROG (PARI) (exp(1))^2/sqrt(Pi) \\ G. C. Greubel, Jan 09 2017 CROSSREFS Cf. A072334, A087197, A222392. Cf. A096789: Sum_{n >= 1} 1/(Gamma(n)*Gamma(n+1)). Cf. A035009 (see fourth comment). Sequence in context: A350106 A205137 A223534 * A332890 A154905 A124739 Adjacent sequences: A222388 A222389 A222390 * A222392 A222393 A222394 KEYWORD nonn,cons AUTHOR Bruno Berselli, Mar 19 2013 STATUS approved

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Last modified May 29 10:34 EDT 2023. Contains 363029 sequences. (Running on oeis4.)