OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,254,0,0,0,-1).
FORMULA
G.f.: -(x^2-x-1)*(x^4+8*x^2+1) / ((x^4-16*x^2+1)*(x^4+16*x^2+1)). - Colin Barker, Nov 18 2013
a(n) = 254*a(n-4) - a(n-8) for n>7. - Vincenzo Librandi, Dec 18 2013
MATHEMATICA
Denominator[Convergents[Sqrt[252], 30]] (* Vincenzo Librandi, Dec 18 2013 *)
PROG
(Magma) I:=[1, 1, 7, 8, 247, 255, 1777, 2032]; [n le 8 select I[n] else 254*Self(n-4)-Self(n-8): n in [1..40]]; // Vincenzo Librandi, Dec 18 2013
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
EXTENSIONS
More terms from Colin Barker, Nov 18 2013
STATUS
approved