A130558 Denominators of partial sums of a series for 6*(5-4*Zeta(3)).

1, 9, 360, 9000, 7000, 343000, 8232000, 666792000, 7334712000, 887500152000, 11537501976000, 1949837833944000, 1949837833944000, 1949837833944000, 265177945416384000, 76636426225334976000, 161788010920151616000

Offset

2,2

Comments

Numerators are given in A130557.

For the rationals r(n) := 4!*Sum_{j=2..n} 1/((j^3)*(j^2-1)), n >= 2, the Z. A. Melzak reference and a W. Lang link see A130557.

Links

Table of n, a(n) for n=2..18.

Formula

a(n) = denominator(r(n)), n >= 2.

Crossrefs

Sequence in context: A119756 A222697 A063068 * A132593 A162133 A197179

Adjacent sequences: A130555 A130556 A130557 * A130559 A130560 A130561

Keyword

nonn,frac,easy

Author

Wolfdieter Lang, Jul 13 2007

Status

approved