OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,3,-2,-2).
FORMULA
a(n) = A080040(n) - (1+(-1)^n)/2.
G.f.: (1+2t^3)/( (t-1)*(1+t)*(2*t^2+2*t-1)).
MATHEMATICA
CoefficientList[Series[(1+2t^3)/(1-2t-3t^2+2t^3+2t^4), {t, 0, 30}], t]
Floor[(1+Sqrt[3])^Range[0, 30]] (* Harvey P. Dale, Sep 14 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Mario Catalani (mario.catalani(AT)unito.it), Jan 21 2003
STATUS
approved