OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,60,0,-1).
FORMULA
G.f.: (29 +30*x +29*x^2 -x^3)/(1 -60*x^2 +x^4). - Vincenzo Librandi, Dec 03 2013
a(n) = 60*a(n-2) - a(n-4), - Vincenzo Librandi, Dec 03 2013
MATHEMATICA
Numerator[Convergents[Sqrt[899], 30]] (* Harvey P. Dale, Oct 16 2013 *)
CoefficientList[Series[(29 + 30 x + 29 x^2 - x^3)/(1 - 60 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 03 2013 *)
PROG
(Magma) I:=[29, 30, 1769, 1799]; [n le 4 select I[n] else 60*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 03 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Dec 03 2013
STATUS
approved