OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200 (terms 0..56 from Vincenzo Librandi)
Index entries for linear recurrences with constant coefficients, signature (0,326,0,-1).
FORMULA
From Colin Barker, Jul 16 2012: (Start)
a(n) = 326*a(n-2)-a(n-4).
G.f.: -(x^2-9*x-1)/((x^2-18*x-1)*(x^2+18*x-1)).
(End)
MATHEMATICA
Denominator[Convergents[Sqrt[328], 30]] (* Harvey P. Dale, Mar 01 2012 *)
CoefficientList[Series[- (x^2 - 9 x - 1)/((x^2 - 18 x - 1)(x^2 + 18 x - 1)), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 25 2013 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved