OFFSET
0,2
REFERENCES
Turner, Zachary J., Bryson W. Finklea, and Terri Moore. "Combinatorial Approaches to Minimal Zero Sequences of Finite Abelian Groups, and a Surprising Connection." Preprint, Jan 09 2004.
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (13,-39,27).
FORMULA
From Chai Wah Wu, Aug 09 2016: (Start)
a(n) = 13*a(n-1) - 39*a(n-2) + 27*a(n-3) for n > 2.
G.f.: 2*x*(5*x - 1)/((x - 1)*(3*x - 1)*(9*x - 1)). (End)
a(n) = (2*3^n+9^n-3)/6. - Colin Barker, Aug 10 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 09 2016
STATUS
approved