OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for linear recurrences with constant coefficients, signature (1, 1).
FORMULA
From Andrew Howroyd, Aug 28 2018: (Start)
a(n) = a(n-1) + a(n-2) for n > 2.
a(n) = 14*Fibonacci(n) - Fibonacci(n-1).
G.f.: x*(14 - x)/(1 - x - x^2).
(End)
MATHEMATICA
LinearRecurrence[{1, 1}, {14, 13}, 80]
PROG
(Magma) I:=[14, 13]; [n le 2 select I[n] else Self(n-1)+Self(n-2): n in [1..40]]; // Vincenzo Librandi, Feb 17 2012
(PARI) Vec((14 - x)/(1 - x - x^2) + O(x^30)) \\ Andrew Howroyd, Aug 28 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vladimir Joseph Stephan Orlovsky, Feb 16 2012
STATUS
approved