A120468 Expansion of -2*x*(-8-12*x+9*x^2) / ( (x-1)*(3*x-1)*(3*x+1)*(1+x) )

0, 16, 24, 142, 240, 1276, 2184, 11482, 19680, 103336, 177144, 930022, 1594320, 8370196, 14348904, 75331762, 129140160, 677985856, 1162261464, 6101872702, 10460353200, 54916854316, 94143178824, 494251688842, 847288609440

Offset

0,2

Links

Table of n, a(n) for n=0..24.

Index entries for linear recurrences with constant coefficients, signature (0,10,0,-9).

Formula

8*a(n) = (-1)^(n+1) * (13+3^(n+2)) + 11*(3^(n+1) -1). - R. J. Mathar, Nov 07 2011

a(2n+1) = 2*A187709(n+1). - R. J. Mathar, Nov 07 2011

Mathematica

LinearRecurrence[{0, 10, 0, -9}, {0, 16, 24, 142}, 30] (* Harvey P. Dale, Dec 06 2023 *)

Crossrefs

Sequence in context: A334229 A335296 A358447 * A166629 A066261 A256526

Adjacent sequences: A120465 A120466 A120467 * A120469 A120470 A120471

Keyword

nonn,easy,less

Author

Roger L. Bagula and Gary W. Adamson, Jul 04 2006

Status

approved