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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)<<n \\ Charles R Greathouse IV, Sep 24 2015

CROSSREFS

Cf. A036289, A007758.

Sequence in context: A212571 A247727 A187174 * A093199 A263507 A261975

Adjacent sequences:  A128793 A128794 A128795 * A128797 A128798 A128799

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian, Apr 07 2007

STATUS

approved

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Last modified June 20 17:27 EDT 2019. Contains 324234 sequences. (Running on oeis4.)