OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,198,0,0,0,-1).
FORMULA
G.f.: -(x^2-x-1)*(x^4+5*x^2+1) / ((x^4-14*x^2-1)*(x^4+14*x^2-1)). - Colin Barker, Nov 23 2013
a(n) = 198*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Dec 23 2013
MATHEMATICA
Denominator[Convergents[Sqrt[392], 30]] (* Vincenzo Librandi, Dec 23 2013 *)
PROG
(Magma) I:=[1, 1, 4, 5, 194, 199, 791, 990]; [n le 8 select I[n] else 198*Self(n-4)-Self(n-8): n in [1..40]]; // Vincenzo Librandi, Dec 23 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 23 2013
STATUS
approved