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 A128796 a(n) = n*(n-1)*2^n. 41
 0, 0, 8, 48, 192, 640, 1920, 5376, 14336, 36864, 92160, 225280, 540672, 1277952, 2981888, 6881280, 15728640, 35651584, 80216064, 179306496, 398458880, 880803840, 1937768448, 4244635648, 9261023232, 20132659200, 43620761600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (6,-12,8). FORMULA G.f.: 8*x^2/(1 - 2*x)^3. - Vincenzo Librandi, Feb 10 2013 a(n) = 8*A001788(n-1). - R. J. Mathar, Apr 26 2015 MATHEMATICA CoefficientList[Series[8 x^2/(1 - 2 x)^3, {x, 0, 30}], x] (* Vincenzo Librandi, Feb 10 2013 *) PROG (MAGMA) [(n^2-n)*2^n: n in [0..30]]; // Vincenzo Librandi, Feb 10 2013 (PARI) a(n)=n*(n-1)<

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Last modified February 18 04:48 EST 2020. Contains 332011 sequences. (Running on oeis4.)