OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 2030, 0, 0, 0, 0, 0, -1).
FORMULA
G.f.: -(x^4-x^3+2*x^2+x+1)*(x^6-26*x^3-1) / (x^12-2030*x^6+1). - Colin Barker, Nov 22 2013
a(n) = 2030*a(n-6) - a(n-12) for n>11. - Vincenzo Librandi, Dec 23 2013
MAPLE
convert(sqrt(381), confrac, 30, cvgts): denom(cvgts); # Wesley Ivan Hurt, Dec 23 2013
MATHEMATICA
Denominator[Convergents[Sqrt[381], 30]] (* Vincenzo Librandi, Dec 23 2013 *)
PROG
(Magma) I:=[1, 1, 2, 25, 27, 52, 2003, 2055, 4058, 50751, 54809, 105560]; [n le 12 select I[n] else 2030*Self(n-6)-Self(n-12): n in [1..40]]; // Vincenzo Librandi, Dec 23 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 22 2013
STATUS
approved