OFFSET
0,3
COMMENTS
The derived sequence a(n+1) + 2*a(n) reads 0,3,0,-2,-1,0 (and repeat with period 6).
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (-3, -3, -3, -3, -3, -2).
FORMULA
MATHEMATICA
CoefficientList[Series[x^2(3+3x+x^2)/((2x+1)(1+x)(1+x+x^2)(x^2-x+1)), {x, 0, 40}], x] (* or *) LinearRecurrence[{-3, -3, -3, -3, -3, -2}, {0, 0, 3, -6, 10, -21}, 40] (* Harvey P. Dale, Sep 08 2011 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Nov 07 2009
EXTENSIONS
Edited and extended by R. J. Mathar, Nov 12 2009
STATUS
approved