OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,22,0,-1).
FORMULA
a(n) = 22*a(n-2)-a(n-4). G.f.: (10+11*x+10*x^2-x^3)/(1-22*x^2+x^4). [Colin Barker, Jul 15 2012]
MATHEMATICA
Numerator[Convergents[Sqrt[120], 30]] (* Vincenzo Librandi, Oct 26 2013 *)
LinearRecurrence[{0, 22, 0, -1}, {10, 11, 230, 241}, 20] (* Harvey P. Dale, Jun 08 2018 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved