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A120468
Expansion of -2*x*(-8-12*x+9*x^2) / ( (x-1)*(3*x-1)*(3*x+1)*(1+x) )
0
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
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
KEYWORD
nonn,easy,less
AUTHOR
STATUS
approved