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 A234846 Decimal expansion of Sum_{n>=0} (2n)!/(n!)^3 = Sum_{n>=0} C(2n,n)/n!. 1
 1, 6, 8, 4, 3, 9, 8, 3, 6, 8, 1, 2, 5, 8, 9, 8, 8, 0, 6, 7, 4, 0, 5, 2, 7, 5, 9, 9, 0, 5, 6, 0, 2, 5, 6, 0, 2, 0, 3, 9, 2, 7, 4, 0, 4, 0, 0, 7, 2, 8, 6, 8, 8, 5, 8, 7, 0, 6, 1, 3, 2, 1, 6, 8, 1, 7, 3, 1, 7, 5, 4, 5, 5, 1, 3, 1, 5, 7, 1, 0, 1, 2, 2, 0, 3, 2, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS FORMULA Equals e^2 * BesselI(0,2) = e^2 * Sum_{n>=0} 1/n!^2. Equals e^4 * Sum_{n>=0} (-1)^n * C(2n,n)/n!. - Amiram Eldar, Nov 06 2020 EXAMPLE 16.843983681258... Equals 1/1 + 2/1 + 24/8 + 720/216 + 40320/13824 + 3628800/1728000 + ... MATHEMATICA RealDigits[E^2*BesselI[0, 2], 10, 100][[1]] (* Amiram Eldar, Nov 06 2020 *) PROG (PARI) exp(2)*besseli(0, 2) \\ Charles R Greathouse IV, Feb 19 2014 CROSSREFS Cf. A000984, A070910. Sequence in context: A100608 A335005 A321075 * A244054 A195701 A247038 Adjacent sequences:  A234843 A234844 A234845 * A234847 A234848 A234849 KEYWORD nonn,cons AUTHOR Richard R. Forberg, Dec 31 2013 EXTENSIONS More terms from Jon E. Schoenfield, Mar 21 2021 STATUS approved

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Last modified August 1 13:12 EDT 2021. Contains 346391 sequences. (Running on oeis4.)