OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,1762,0,0,0,-1).
FORMULA
G.f.: -(x^2-2*x-1)*(x^4+14*x^2+1) / ((x^4-42*x^2+1)*(x^4+42*x^2+1)). - Colin Barker, Dec 25 2013
a(n) = 1762*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Feb 01 2014
MATHEMATICA
Denominator[Convergents[Sqrt[990], 30]] (* Vincenzo Librandi, Feb 01 2014 *)
PROG
(Magma) I:=[1, 2, 13, 28, 1749, 3526, 22905, 49336]; [n le 8 select I[n] else 1762*Self(n-4)-Self(n-8): n in [1..30]]; // Vincenzo Librandi, Feb 01 2014
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 25 2013
STATUS
approved