OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,48,0,-1).
FORMULA
G.f.: -(x^3 - 23*x^2 - 24*x - 23)/(x^4 - 48*x^2 + 1). - Vincenzo Librandi, Nov 16 2013
a(n) = 48*a(n-2) - a(n-4). - Vincenzo Librandi, Nov 12 2013
MATHEMATICA
Numerator[Convergents[Sqrt[575], 20]] (* Harvey P. Dale, Aug 10 2011 *)
CoefficientList[Series[-(x^3 - 23 x^2 - 24 x - 23)/(x^4 - 48 x^2 + 1), {x, 0, 30}], x] (* Vincenzo Librandi, Nov 16 2013 *)
PROG
(Magma) I:=[23, 24, 1127, 1151]; [n le 4 select I[n] else 48*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Nov 16 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy,less
AUTHOR
STATUS
approved