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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. 1
30, 840, 3780, 3520, 750750, 98280, 2099160, 7441920, 10665270, 5313000, 119390700, 3931200, 40139190, 18501420, 313038000, 241274880, 2175918570, 266493240, 1535455740, 3258024000, 1007504190, 172657320, 16812360600, 3742502400 (list; graph; refs; listen; history; text; internal format)
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

Cf. A002117, A256323 (numerators).

Sequence in context: A160269 A049394 A143169 * A001201 A007850 A162833

Adjacent sequences:  A256321 A256322 A256323 * A256325 A256326 A256327

KEYWORD

nonn,frac,easy

AUTHOR

Jean-Fran├žois Alcover, Mar 24 2015

STATUS

approved

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)