OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,20,0,-1).
FORMULA
G.f.: -(x^3-9*x^2-10*x-9) / (x^4-20*x^2+1). - Colin Barker, Nov 05 2013
MATHEMATICA
Numerator[Convergents[Sqrt[99], 30]] (* Vincenzo Librandi, Oct 30 2013 *)
LinearRecurrence[{0, 20, 0, -1}, {9, 10, 189, 199}, 40] (* Harvey P. Dale, Jan 23 2019 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 05 2013
STATUS
approved