A145428 Decimal expansion of sum_{n=1..inf} 3^n*(n!)^2/(2n)!.

1, 0, 2, 5, 5, 1, 9, 7, 4, 5, 6, 9, 3, 6, 8, 7, 1, 4, 0, 2, 3, 7, 6, 3, 1, 3, 0, 3, 0, 5, 6, 8, 6, 2, 2, 9, 2, 9, 1, 3, 6, 2, 6, 4, 9, 9, 2, 3, 7, 0, 9, 6, 2, 3, 0, 2, 2, 7, 9, 5, 3, 9, 7, 4, 1, 5, 5, 2, 4, 9, 2, 7, 2, 4, 5, 0, 5, 4, 1, 5, 5, 3, 4, 7, 3, 6, 4, 9, 9, 9, 5, 2, 8

Offset

2,3

References

Alexander Apelblat, Tables of Integrals and Series, Harri Deutsch, (1996), 4.1.34

Links

Table of n, a(n) for n=2..94.

Formula

3+10*A019694*A020760.

Example

10.255197456936871...

Maple

4/3*Pi*3^(1/2)+3 ;

Crossrefs

Sequence in context: A160177 A320428 A340422 * A086283 A153759 A269992

Adjacent sequences: A145425 A145426 A145427 * A145429 A145430 A145431

Keyword

cons,easy,nonn

Author

R. J. Mathar, Feb 08 2009

Status

approved