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, 206, 0, 0, 0, -1).
FORMULA
G.f.: -(x^2-x-1)*(x^4+4*x^2+1) / (x^8-206*x^4+1). - Colin Barker, Dec 06 2013
a(n) = 206*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Jan 19 2014
MAPLE
convert(sqrt(663), confrac, 30, cvgts): denom(cvgts); # Wesley Ivan Hurt, Dec 07 2013
MATHEMATICA
Denominator[Convergents[Sqrt[663], 30]] (* Vincenzo Librandi, Jan 19 2014 *)
PROG
(Magma) I:=[1, 1, 3, 4, 203, 207, 617, 824]; [n le 8 select I[n] else 206*Self(n-4)-Self(n-8): n in [1..40]]; // Vincenzo Librandi, Jan 19 2014
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 06 2013
STATUS
approved