OFFSET
0,3
LINKS
Harry J. Smith, Table of n, a(n) for n = 0..200
M. Azaola and F. Santos, The number of triangulations of the cyclic polytope C(n,n-4), Discrete Comput. Geom., 27 (2002), 29-48.
Index entries for linear recurrences with constant coefficients, signature (6,-13,12,-4).
FORMULA
G.f.: (1-5*x+11*x^2-9*x^3)/((1-x)^2*(1-2*x)^2). - Colin Barker, Apr 19 2012
MATHEMATICA
Table[(n+2)2^(n-1)-2n, {n, 0, 30}] (* Harvey P. Dale, Apr 18 2019 *)
PROG
(PARI) a(n) = { (n + 2)*2^(n - 1) - 2*n } \\ Harry J. Smith, Feb 11 2010
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jan 04 2002
STATUS
approved