OFFSET
0,2
LINKS
Paolo Xausa, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (5,1).
FORMULA
G.f.: (1-x-x^2)/(1-5*x-x^2).
a(n) = Sum_{k=0..n} A155161(n,k)*4^k. - Philippe Deléham, Feb 08 2012
MATHEMATICA
LinearRecurrence[{5, 1}, {1, 4, 20}, 25] (* Paolo Xausa, Jan 19 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Jan 21 2009
STATUS
approved