OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,62,0,-1).
FORMULA
G.f.: (30 + 31*x + 30*x^2 - x^3)/(1 - 62*x^2 + x^4). - Vincenzo Librandi, Dec 08 2013
a(n) = 62*a(n-2) - a(n-4). - Vincenzo Librandi, Dec 08 2013
MATHEMATICA
Numerator[Convergents[Sqrt[960], 30]] (* Vincenzo Librandi, Dec 07 2013 *)
CoefficientList[Series[(30 + 31 x + 30 x^2 - x^3)/(1 - 62 x^2 + x^4), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 08 2013 *)
PROG
(Magma) I:=[ 30, 31, 1890, 1921]; [n le 4 select I[n] else 62*Self(n-2)-Self(n-4): n in [1..30]]; // Vincenzo Librandi, Dec 08 2013
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Dec 08 2013
STATUS
approved