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 A128960 a(n) = (n^3 - n)*2^n. 9
 0, 24, 192, 960, 3840, 13440, 43008, 129024, 368640, 1013760, 2703360, 7028736, 17891328, 44728320, 110100480, 267386880, 641728512, 1524105216, 3586129920, 8367636480, 19377684480, 44568674304, 101871255552, 231525580800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (8,-24,32,-16). FORMULA G.f.: 24*x^2/(1-2*x)^4. - Vincenzo Librandi, Feb 12 2013 a(n) = 8*a(n-1)-24*a(n-2)+32*a(n-3)-16*a(n-4). - Vincenzo Librandi, Feb 12 2013 MATHEMATICA CoefficientList[Series[24 x/(1 - 2 x)^4, {x, 0, 30}], x] (* or *) LinearRecurrence[{8, -24, 32, -16}, {0, 24, 192, 960}, 30] (* Vincenzo Librandi, Feb 12 2013 *) PROG (MAGMA) [(n^3-n)*2^n: n in [1..25]]; /* or */ I:=[0, 24, 192, 960]; [n le 4 select I[n] else 8*Self(n-1)-24*Self(n-2)+32*Self(n-3)-16*Self(n-4): n in [1..25]]; // Vincenzo Librandi, Feb 12 2013 (PARI) a(n)=(n^3-n)<

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Last modified January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)