OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (5, -2).
FORMULA
From R. J. Mathar, Apr 10 2009: (Start)
G.f.: -(-5+4*x)/(1-5*x+2*x^2).
MATHEMATICA
LinearRecurrence[{5, -2}, {5, 21}, 50] (* G. C. Greubel, Jun 27 2018 *)
PROG
(PARI) x='x+O('x^30); Vec(-(-5+4*x)/(1-5*x+2*x^2)) \\ G. C. Greubel, Jun 27 2018
(Magma) I:=[5, 21]; [n le 2 select I[n] else 5*Self(n-1) - 2*Self(n-2): n in [1..30]]; // G. C. Greubel, Jun 27 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Creighton Dement, Apr 08 2009
STATUS
approved