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 A228701 a(n) = 2^(n-1)*(3^n-2^(n+1)+1). 0
 0, 0, 4, 48, 400, 2880, 19264, 123648, 774400, 4776960, 29185024, 177205248, 1071616000, 6463242240, 38913654784, 234018766848, 1406260019200, 8446149918720, 50711258988544, 304404992360448, 1826979708928000, 10964077274726400, 65793259737186304, 394794742786818048, 2368909194192486400, 14214018115074785280, 85286360490195288064 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..26. J. Brandts and C. Cihangir, Counting triangles that share their vertices with the unit n-cube, in Conference Applications of Mathematics 2013 in honor of the 70th birthday of Karel Segeth. Jan Brandts, Sergey Korotov, et al., eds., Institute of Mathematics AS CR, Prague 2013. Index entries for linear recurrences with constant coefficients, signature (12,-44,48). FORMULA G.f.: -4*x^2 / ((2*x-1)*(4*x-1)*(6*x-1)). - Colin Barker, Sep 06 2013 MATHEMATICA LinearRecurrence[{12, -44, 48}, {0, 0, 4}, 30] (* Harvey P. Dale, Sep 13 2016 *) CROSSREFS Sequence in context: A192831 A158681 A269180 * A111903 A059409 A357663 Adjacent sequences: A228698 A228699 A228700 * A228702 A228703 A228704 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Sep 05 2013 STATUS approved

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Last modified April 14 14:16 EDT 2024. Contains 371665 sequences. (Running on oeis4.)