OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,222,0,0,0,-1).
FORMULA
G.f.: -(x^2 -x -1)*(x^4 +4*x^2 +1) / (x^8 -222*x^4 +1). - Colin Barker, Dec 15 2013
a(n) = 222*a(n-4) - a(n-8). - Vincenzo Librandi, Dec 15 2013
MATHEMATICA
Denominator[Convergents[Sqrt[770], 30]] (* Vincenzo Librandi, Dec 15 2013 *)
PROG
(Magma) I:=[1, 1, 3, 4, 219, 223, 665, 888]; [n le 8 select I[n] else 222*Self(n-4)-Self(n-8): n in [1..40]]; // Vincenzo Librandi, Dec 15 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 15 2013
STATUS
approved