OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,258,0,-1).
FORMULA
G.f.: -(x^2-8*x-1) / ((x^2-16*x-1)*(x^2+16*x-1)). - Colin Barker, Nov 18 2013
a(n) = 258*a(n-2) - a(n-4) for n>3. - Vincenzo Librandi, Dec 18 2013
MATHEMATICA
Denominator[Convergents[Sqrt[260], 30]] (* Vincenzo Librandi, Dec 18 2013 *)
PROG
(Magma) I:=[1, 8, 257, 2064]; [n le 4 select I[n] else 258*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 18 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 18 2013
STATUS
approved