OFFSET
0,1
COMMENTS
LINKS
FORMULA
Binet form: a(n)=2^n*(((3 + Sqrt[6])/2)*((1 + Sqrt[6])/2)^n + ((3 - Sqrt[6])/2)*((1 - Sqrt[6])/2)^n) = 3*A180168(n).
MATHEMATICA
a[n_] = 2^n*(((3 + Sqrt[ 6])/2)*((1 + Sqrt[6])/2)^n + ((3 - Sqrt[6])/2)*((1 - Sqrt[6])/2)^n); Table[FullSimplify[a[n]], {n, 0, 30}]
CoefficientList[Series[(-3(1+x))/(5x^2+2x-1), {x, 0, 40}], x] (* Harvey P. Dale, Feb 24 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Roger L. Bagula, Apr 26 2010
STATUS
approved