OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,21220,0,0,0,0,0,-1).
FORMULA
a(n) = 21220*a(n-6)-a(n-12). G.f.: -(x^11 -11*x^10 +23*x^9 -103*x^8 +1156*x^7 -4727*x^6 -10610*x^5 -4727*x^4 -1156*x^3 -103*x^2 -23*x -11) / (x^12-21220*x^6+1). [Colin Barker, Jul 19 2012]
MATHEMATICA
Numerator[Convergents[Sqrt[131], 25]] (* Vincenzo Librandi, Oct 27 2013 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved