OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = Fib(n+3)+1. a(n) = 2a(n-1) - a(n-3).
a(n) = A020706(n-1), n>0. [From R. J. Mathar, Oct 15 2008]
G.f.: (3-2*x-2*x^2)/((1-x)*(1-x-x^2)). [Colin Barker, Apr 16 2012]
MATHEMATICA
CoefficientList[Series[(3-2*x-2*x^2)/((1-x)*(1-x-x^2)), {x, 0, 40}], x] (* Vincenzo Librandi, Apr 27 2012 *)
PROG
(PARI) a(n)=fibonacci(n+3)+1 \\ Charles R Greathouse IV, Apr 16 2012
(Magma) [Fibonacci(n+3)+1: n in [0..40]]; // Vincenzo Librandi, Apr 27 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved