A256324 - OEIS

A256324

a(n) = denominator of (1/n^3)*(-1/(n+1) + 16/(n+2) + 3/(4*(2*n+1)) - 81/(4*(2*n+3))), term of a BBP-type series representation of zeta(3) by V. Adamchik and S. Wagon.

30, 840, 3780, 3520, 750750, 98280, 2099160, 7441920, 10665270, 5313000, 119390700, 3931200, 40139190, 18501420, 313038000, 241274880, 2175918570, 266493240, 1535455740, 3258024000, 1007504190, 172657320, 16812360600, 3742502400

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

Victor Adamchik and Stan Wagon, Pi: A 2000-Year Search Changes Direction

David Bailey, Peter Borwein, Simon Plouffe, On the rapid computation of various polylogarithmic constants

Eric Weisstein's MathWorld, BBP-Type Formula

Wikipedia, Bailey-Borwein-Plouffe formula

MATHEMATICA

a[n_] := Denominator[(1/n^3)*(-1/(n+1) + 16/(n+2) + 3/(4*(2*n+1)) - 81/(4*(2*n+3)))]; Table[a[n], {n, 1, 40}]

CROSSREFS