OFFSET
0,3
COMMENTS
Essentially 2 * A210448. - Joerg Arndt, Aug 03 2014
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (5,-6).
FORMULA
G.f.: (-1 +5*x)/((1-2*x)(1-3*x)).
a(n) = 5*a(n-1) -6*a(n-2) for n>1.
MATHEMATICA
CoefficientList[Series[(-1 + 5 x)/((1 - 2 x) (1 - 3 x)), {x, 0, 30}], x]
Table[(2 3^n - 3 2^n), {n, 0, 30}] (* Vincenzo Librandi, Aug 04 2014 *)
PROG
(Magma) [2*3^n-3*2^n: n in [0..40]]; /* or */ I:=[-1, 0]; [n le 2 select I[n] else 5*Self(n-1)-6*Self(n-2): n in [1..30]];
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Vincenzo Librandi, Aug 03 2014
STATUS
approved