A121199 12n+7^n+5^n.

2, 24, 98, 504, 3074, 19992, 133346, 901752, 6155522, 42306840, 292240994, 2026155000, 14085427970, 98109713688, 684326588642, 4778079088248, 33385518460418, 233393453440536, 1632228295176290, 11417968671701496

Offset

0,1

Links

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

Index entries for linear recurrences with constant coefficients, signature (14,-60,82,-35).

Formula

G.f.: 2*(1-2*x-59*x^2+204*x^3)/((1-x)^2*(1-7*x)*(1-5*x)). - Vincenzo Librandi, Feb 23 2013

Mathematica

CoefficientList[Series[2 (1 - 2 x - 59 x^2 + 204 x^3)/((1-x)^2 (1-7 x) (1-5 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Feb 23 2013 *)
Table[12 n + 7^n + 5^n, {n, 0, 20}] (* Bruno Berselli, Feb 27 2013 *)
LinearRecurrence[{14, -60, 82, -35}, {2, 24, 98, 504}, 20] (* Harvey P. Dale, Aug 15 2013 *)

Prog

(PARI) for(n=0, 20, print1(12*n+7^n+5^n", ")); \\ Bruno Berselli, Feb 27 2013
(Magma) [12*n+7^n+5^n: n in [0..20]]; // Bruno Berselli, Feb 27 2013

Crossrefs

Cf. A074616.

Sequence in context: A172225 A145889 A212568 * A009538 A009556 A179824

Adjacent sequences: A121196 A121197 A121198 * A121200 A121201 A121202

Keyword

nonn,easy

Author

Mohammad K. Azarian, Aug 19 2006

Extensions

Edited by Ray Chandler, Sep 06 2006

Status

approved