A013828 a(n) = 3^(5*n + 3).

27, 6561, 1594323, 387420489, 94143178827, 22876792454961, 5559060566555523, 1350851717672992089, 328256967394537077627, 79766443076872509863361, 19383245667680019896796723, 4710128697246244834921603689

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..200
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (243).

Crossrefs

Cf. A000244 (3^n), A016885 (5*n+3).

Programs

Magma

[3^(5*n+3): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011

Mathematica

3^(5*Range[0,20]+3) (* or *) NestList[243#&,27,20] (* Harvey P. Dale, Jun 07 2016 *)

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 243*a(n-1), n > 0; a(0)=27.

G.f.: 27/(1-243*x).

a(n) = 3*A013827(n) = 9*A013826(n) = A013829(n)/3. (End)