OFFSET
0,3
COMMENTS
A signed version of A058481 preceded by 1.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (-4, -3).
FORMULA
a(n) = -4*a(n-1) - 3*a(n-2) for n > 1; a(0) = 1, a(1) = 1.
G.f.: (1 + 5*x)/((1+x)*(1+3*x)).
E.g.f.: 2*exp(-x) - exp(-3*x). - G. C. Greubel, Jul 26 2016
MATHEMATICA
Table[(2 - 3^n)*(-1)^n, {n, 0, 50}] (* G. C. Greubel, Jul 26 2016 *)
PROG
(Magma) [ (2-3^n)*(-1)^n: n in [0..25] ];
(PARI) a(n)=(2-3^n)*(-1)^n \\ Charles R Greathouse IV, Jul 26 2016
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Klaus Brockhaus, Nov 30 2009
STATUS
approved