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A145430
Decimal expansion of sum_{n=1..inf} n^2*(n!)^2/(2n)!.
0
2, 0, 0, 5, 1, 1, 0, 8, 7, 5, 6, 4, 2, 3, 0, 2, 9, 0, 7, 6, 2, 7, 4, 3, 6, 3, 9, 1, 7, 1, 9, 3, 1, 6, 9, 3, 7, 8, 8, 2, 9, 8, 7, 4, 9, 9, 2, 9, 3, 6, 0, 7, 6, 2, 0, 5, 8, 1, 4, 3, 8, 8, 6, 4, 9, 5, 8, 5, 6, 4, 1, 4, 1, 1, 5, 7, 9, 0, 8, 8, 4, 5, 8, 0, 8, 9, 3, 5, 1, 8, 0, 8, 1
OFFSET
1,1
REFERENCES
Alexander Apelblat, Tables of Integrals and Series, Harri Deutsch, (1996), 4.1.36
FORMULA
(2/81)*(54+5*Pi*sqrt(3)).
EXAMPLE
2.00511087564...
MAPLE
4/3+10/81*Pi*3^(1/2) ;
MATHEMATICA
RealDigits[(2/81)*(54+5*Pi*Sqrt[3]), 10, 120][[1]] (* Harvey P. Dale, Jun 13 2011 *)
CROSSREFS
Sequence in context: A158830 A275744 A290321 * A143160 A369730 A156387
KEYWORD
cons,easy,nonn
AUTHOR
R. J. Mathar, Feb 08 2009
STATUS
approved