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A137426
a(n)=-a(n-1)+2a(n-3).
1
0, 1, -3, 3, -1, -5, 11, -13, 3, 19, -45, 51, -13, -77, 179, -205, 51, 307, -717, 819, -205, -1229, 2867, -3277, 819, 4915, -11469, 13107, -3277, -19661, 45875, -52429, 13107, 78643, -183501, 209715, -52429, -314573, 734003, -838861, 209715, 1258291
OFFSET
0,3
FORMULA
G.f.: (2*x^2-x)/(2*x^3-x-1). - Harvey P. Dale, Dec 03 2012
MATHEMATICA
LinearRecurrence[{-1, 0, 2}, {0, 1, -3}, 80] (* Harvey P. Dale, Dec 03 2012 *)
CROSSREFS
Sequence in context: A071945 A209583 A144944 * A269949 A074456 A016454
KEYWORD
sign
AUTHOR
Paul Curtz, Apr 17 2008
EXTENSIONS
More terms from Harvey P. Dale, Dec 03 2012
STATUS
approved