OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,970,0,-1).
FORMULA
G.f.: (22 + 485*x + 22*x^2 - x^3)/(1 - 970*x^2 + x^4). - Vincenzo Librandi, Nov 12 2013
a(n) = 970*a(n-2) - a(n-4). - Vincenzo Librandi, Nov 12 2013
MATHEMATICA
Numerator[Convergents[Sqrt[486], 30]] (* or *) CoefficientList[Series[(22 + 485 x + 22 x^2 - x^3)/(1 - 970 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Nov 12 2013 *)
PROG
(Magma) I:=[22, 485, 21362, 470449]; [n le 4 select I[n] else 970*Self(n-2)-Self(n-4): n in [1..25]]; // Vincenzo Librandi, Nov 12 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy,less
AUTHOR
STATUS
approved