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, 0, 0, 0, 0, 0, 0, 330674, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1).
FORMULA
G.f.: -(x^18 -4*x^17 +5*x^16 -14*x^15 +19*x^14 -318*x^13 +337*x^12 -992*x^11 +1329*x^10 -6308*x^9 -1329*x^8 -992*x^7 -337*x^6 -318*x^5 -19*x^4 -14*x^3 -5*x^2 -4*x -1) / (x^20 -330674*x^10 +1). - Colin Barker, Dec 07 2013
a(n) = 330674*a(n-10) - a(n-20). - Wesley Ivan Hurt, Jun 26 2022
MATHEMATICA
Denominator[Convergents[Sqrt[687], 30]] (* Vincenzo Librandi, Jan 20 2014 *)
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Dec 07 2013
STATUS
approved