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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 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-François Alcover, Mar 24 2015 STATUS approved

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