login
A120990
5^n-3^n-2n.
1
0, 0, 12, 92, 536, 2872, 14884, 75924, 384048, 1933424, 9706556, 48650956, 243609160, 1219108776, 6098732628, 30503229188, 152544843872, 762810312928, 3814309845100, 19072324066620, 95363944856184, 476826697849880
OFFSET
0,3
LINKS
FORMULA
G.f.: 4*x^2*(3-7*x)/((1-x)^2*(1-5*x)*(1-3*x)) . - Vincenzo Librandi, Feb 23 2013
MATHEMATICA
CoefficientList[Series[4 x^2 (3 - 7 x)/((1 - x)^2 (1 - 5 x)(1 - 3 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 23 2013 *)
CROSSREFS
Sequence in context: A339715 A298397 A246585 * A220330 A055022 A220937
KEYWORD
nonn,easy
AUTHOR
Mohammad K. Azarian, Aug 19 2006
STATUS
approved