OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,24,0,-1).
FORMULA
G.f.: (11+12*x+11*x^2-x^3)/(1-24*x^2+x^4). - Vincenzo Librandi, Nov 01 2013
a(n) = 24*a(n-2)-a(n-4). - Vincenzo Librandi, Nov 01 2013
MATHEMATICA
Numerator[Convergents[Sqrt[143], 30]] (* or *) CoefficientList[Series[(11 + 12 x + 11 x^2 - x^3)/(1 - 24 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 31 2013 *)
PROG
(Magma) I:=[11, 12, 275, 287]; [n le 4 select I[n] else 24*Self(n-2)-Self(n-4): n in [1..25]]; // Vincenzo Librandi, Nov 01 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved