OFFSET
1,2
LINKS
FORMULA
From Philippe Deléham, Dec 12 2006: (Start)
a(n) = 4*a(n-1) + 14*a(n-2) for n >= 2; a(0)=0, a(1)=3.
G.f.: 3x/(1-4*x-14*x^2). (End)
MATHEMATICA
Expand[Table[((2 + 3Sqrt[2])^n - (2 - 3Sqrt[2])^n)/(2Sqrt[2]), {n, 0, 30}]]
LinearRecurrence[{4, 14}, {0, 3}, 50] (* Amiram Eldar, Mar 29 2020 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Artur Jasinski, Dec 10 2006
EXTENSIONS
More terms from Amiram Eldar, Mar 29 2020
STATUS
approved