A013745 a(n) = 9^(3*n + 2).

81, 59049, 43046721, 31381059609, 22876792454961, 16677181699666569, 12157665459056928801, 8862938119652501095929, 6461081889226673298932241, 4710128697246244834921603689, 3433683820292512484657849089281

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 (729).

Formula

From Philippe Deléham, Nov 30 2008: (Start)

a(n) = 729*a(n-1); a(0)=81.

G.f.: 81/(1-729*x). (End)

Mathematica

9^(3Range[0, 20]+2)  (* Harvey P. Dale, Mar 30 2011 *)

Prog

(Magma) [9^(3*n+2): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011
(PARI) a(n)=9^(3*n+2) \\ Charles R Greathouse IV, Jul 10 2016

Crossrefs

Subsequence of A001019 (9^n).

Sequence in context: A017560 A128493 A145261 * A093227 A187751 A285997

Adjacent sequences: A013742 A013743 A013744 * A013746 A013747 A013748

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved