A120990 5^n-3^n-2n.

0, 0, 12, 92, 536, 2872, 14884, 75924, 384048, 1933424, 9706556, 48650956, 243609160, 1219108776, 6098732628, 30503229188, 152544843872, 762810312928, 3814309845100, 19072324066620, 95363944856184, 476826697849880

Offset: 0

Author

Mohammad K. Azarian, Aug 19 2006

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A074606, A005058.

Programs

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 *)

Formula

G.f.: 4*x^2*(3-7*x)/((1-x)^2*(1-5*x)*(1-3*x)) . - Vincenzo Librandi, Feb 23 2013