A013791 a(n) = 9^(4*n + 3).

729, 4782969, 31381059609, 205891132094649, 1350851717672992089, 8862938119652501095929, 58149737003040059690390169, 381520424476945831628649898809, 2503155504993241601315571986085849, 16423203268260658146231467800709255289

Offset

0,1

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 (6561).

Formula

From Philippe Deléham, Dec 07 2008: (Start)

a(n) = 6561*a(n-1); a(0)=729.

G.f.: 729/(1-6561*x).

a(n) = 81*A013790(n). (End)

Mathematica

9^(4*Range[0, 20]+3) (* or *) NestList[6561#&, 729, 20] (* Harvey P. Dale, Jul 30 2021 *)

Prog

(Magma) [9^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jun 28 2011
(PARI) a(n)=9^(4*n+3) \\ Charles R Greathouse IV, Jul 11 2016

Crossrefs

Subsequence of A001019.

Sequence in context: A017022 A017106 A017202 * A017310 A017430 A017562

Adjacent sequences: A013788 A013789 A013790 * A013792 A013793 A013794

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved