OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0, 164, 0, -1).
FORMULA
G.f.: (27 + 82*x + 27*x^2 - x^3)/(1 - 164*x^2 + x^4), - Vincenzo Librandi, Nov 24 2013
a(n) = 164*a(n-2) - a(n-4). - Vincenzo Librandi, Nov 24 2013
MATHEMATICA
Numerator[Convergents[Sqrt[747], 30]] (* or *) CoefficientList[Series[(27 + 82 x + 27 x^2 - x^3)/(1 - 164 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Nov 24 2013 *)
PROG
(Magma) I:=[27, 82, 4455, 13447]; [n le 4 select I[n] else 164*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Nov 24 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved