OFFSET
0,2
COMMENTS
Binomial transform of A082412.
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 0..250
Index entries for linear recurrences with constant coefficients, signature (12,-27).
FORMULA
G.f.: (1-5*x)/((1-3*x)*(1-9*x));
E.g.f.: (2*exp(9*x) + exp(3*x))/3.
a(n) = (2*9^n + 3^n)/3.
MAPLE
seq((2*9^n+3^n)/3, n=0..19); # Nathaniel Johnston, Jun 26 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 23 2003
STATUS
approved