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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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..74.

FORMULA

e^2 * BesselI(0,2) = e^2 * sum(n>=0, 1/n!^2 ).

EXAMPLE

16.843983681258...

a(n) = 1/1 + 2/1 + 24/8 + 720/216 + 40320/13824 + 3628800/1728000 + ...

PROG

(PARI) exp(2)*besseli(0, 2) \\ Charles R Greathouse IV, Feb 19 2014

CROSSREFS

Cf. A070910.

Sequence in context: A255728 A272488 A100608 * A244054 A195701 A247038

Adjacent sequences:  A234843 A234844 A234845 * A234847 A234848 A234849

KEYWORD

nonn,cons

AUTHOR

Richard R. Forberg, Dec 31 2013

STATUS

approved

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Last modified February 24 13:18 EST 2018. Contains 299623 sequences. (Running on oeis4.)