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

Author

Wolfdieter Lang, Jul 13 2007

Keywords

• nonn
• frac
• easy

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.

Formula

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