OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..130
Index entries for linear recurrences with constant coefficients, signature (0, 162, 0, -1).
FORMULA
From Colin Barker, Jul 16 2012: (Start)
a(n) = 162*a(n-2) - a(n-4).
G.f.: -(x^3-20*x^2-81*x-20)/(x^4-162*x^2+1). (End)
MATHEMATICA
Numerator[Convergents[Sqrt[410], 40]] (* Vincenzo Librandi, Nov 13 2011 *)
LinearRecurrence[{0, 162, 0, -1}, {20, 81, 3260, 13121}, 30] (* Harvey P. Dale, Jul 19 2015 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy,less
AUTHOR
STATUS
approved