OFFSET
0,2
COMMENTS
Third binomial transform of A010687 (period 2: repeat 1,6). [Bruno Berselli, Aug 06 2013]
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (6,-8).
FORMULA
G.f.: (1+3*x)/((1-2*x)*(1-4*x)).
a(n) = 7*4^n/2-5*2^n/2.
MATHEMATICA
CoefficientList[Series[(1 + 3 x)/((1 - 2 x) (1 - 4 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Aug 07 2013 *)
PROG
(Magma) [7*4^n/2-5*2^n/2: n in [0..25]]; // Vincenzo Librandi, Aug 07 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Mar 11 2003
STATUS
approved