OFFSET
1,2
LINKS
FORMULA
a(n) = 3*a(n-1) + 5*a(n-2) + a(n-3).
G.f.: -x*(1+3*x) / ( (1+x)*(x^2+4*x-1) ). a(n) + a(n+1) = A048876(n). - R. J. Mathar, Oct 22 2013
a(n) = (Lucas(3n-1) + (-1)^n)/2. - Greg Dresden, Oct 09 2020
MATHEMATICA
LinearRecurrence[{3, 5, 1}, {1, 6, 23}, 25] (* James C. McMahon, Oct 09 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Gary W. Adamson and Roger L. Bagula, Jul 04 2006
EXTENSIONS
Edited by N. J. A. Sloane, Dec 03 2006
a(24)-a(25) from James C. McMahon, Oct 09 2024
STATUS
approved