OFFSET
0,2
LINKS
FORMULA
From Reinhard Zumkeller, Mar 04 2011: (Start)
G.f.: (1+2x)/((1-3x)*(1+3x)).
E.g.f.: (5*exp(3x) + exp(-3x))/6.
a(n+3) = a(n+2)*a(n+1)/a(n). (End)
a(n) = 9*a(n-2). - Vincenzo Librandi, Mar 20 2011
MATHEMATICA
LinearRecurrence[{0, 9}, {1, 2}, 30] (* Harvey P. Dale, Dec 04 2019 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 30 2003
STATUS
approved