OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8,4).
FORMULA
G.f.: x/(1 - 8*x - 4*x^2). - R. J. Mathar, Nov 21 2011
a(n+1) = Sum_{k, 0<=k<=n} A099089(n,k)*4^k. - Philippe Deléham, Nov 21 2011
MATHEMATICA
LinearRecurrence[{8, 4}, {0, 1}, 50]
PROG
(Magma) I:=[0, 1]; [n le 2 select I[n] else 8*Self(n-1)+4*Self(n-2): n in [1..20]]; // Vincenzo Librandi, Nov 23 2011
(PARI) x='x+O('x^30); concat([0], Vec(x/(1-8*x-4*x^2))) \\ G. C. Greubel, Jan 24 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vladimir Joseph Stephan Orlovsky, May 24 2011
STATUS
approved