OFFSET
0,1
LINKS
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (1, 1).
FORMULA
G.f.: (4+7x)/(1-x-x^2). - Philippe Deléham, Nov 19 2008
a(n) = ((10 + 9*sqrt(5))/5)*((1 + sqrt(5))/2)^n + ((10 - 9*sqrt(5))/5)*((1 - sqrt(5))/2)^n starting at n=0. - Bogart B. Strauss, Oct 27 2013
MATHEMATICA
a={}; b=4; c=11; AppendTo[a, b]; AppendTo[a, c]; Do[b=b+c; AppendTo[a, b]; c=b+c; AppendTo[a, c], {n, 4!}]; a (* Vladimir Joseph Stephan Orlovsky, Sep 17 2008 *)
LinearRecurrence[{1, 1}, {4, 11}, 40] (* Harvey P. Dale, May 08 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved