OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,394,0,-1).
FORMULA
G.f.: -(x^2-14*x-1) / (x^4-394*x^2+1). - Colin Barker, Nov 16 2013
a(n) = 394*a(n-2) - a(n-4). - Vincenzo Librandi, Dec 16 2013
MATHEMATICA
Denominator[Convergents[Sqrt[198], 30]] (* Harvey P. Dale, May 14 2013 *)
CoefficientList[Series[(1 + 14 x - x^2)/(x^4 - 394 x^2 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 16 2013 *)
PROG
(Magma) I:=[1, 14, 393, 5516]; [n le 4 select I[n] else 394*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 16 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 16 2013
STATUS
approved