OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = 17*2^(n-1)-3.
G.f. x*(14-11*x)/((1-x)*(1-2*x)). [R. J. Mathar, Feb 09 2009]
MATHEMATICA
CoefficientList[Series[(14 - 11 x)/((1-x) (1-2 x)), {x, 0, 40}], x] (* Vincenzo Librandi, Apr 08 2013 *)
PROG
(Magma) [17*2^(n-1)-3: n in [1..30]]; // Vincenzo Librandi, Apr 08 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 08 2009
EXTENSIONS
Corrected typo in a(11) by R. J. Mathar, Feb 09 2009
STATUS
approved