OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,110,0,-1).
FORMULA
G.f.: -(x^2-2*x-1) / (x^4-110*x^2+1). - Colin Barker, Dec 14 2013
MATHEMATICA
Denominator[Convergents[Sqrt[756], 30]] (* Harvey P. Dale, Aug 17 2012 *)
CoefficientList[Series[(1 + 2 x - x^2)/(x^4 - 110 x^2 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 22 2014 *)
PROG
(Magma) I:=[1, 2, 109, 220]; [n le 4 select I[n] else 110*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Jan 22 2014
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
Additional term from Colin Barker, Dec 14 2013
STATUS
approved