OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,978,0,0,0,-1).
FORMULA
G.f.: -(x^2-2*x-1)*(x^4+14*x^2+1) / (x^8-978*x^4+1). - Colin Barker, Nov 19 2013
a(n) = 978*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Dec 20 2013
MATHEMATICA
Denominator[Convergents[Sqrt[305], 30]] (* Vincenzo Librandi, Dec 20 2013 *)
LinearRecurrence[{0, 0, 0, 978, 0, 0, 0, -1}, {1, 2, 13, 28, 965, 1958, 12713, 27384}, 30] (* Harvey P. Dale, Nov 03 2015 *)
PROG
(Magma) I:=[1, 2, 13, 28, 965, 1958, 12713, 27384]; [n le 8 select I[n] else 978*Self(n-4)-Self(n-8): n in [1..40]]; // Vincenzo Librandi, Dec 20 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 19 2013
STATUS
approved