A013732 a(n) = 3^(3*n + 1).

3, 81, 2187, 59049, 1594323, 43046721, 1162261467, 31381059609, 847288609443, 22876792454961, 617673396283947, 16677181699666569, 450283905890997363, 12157665459056928801, 328256967394537077627, 8862938119652501095929

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 (27).

Formula

From Philippe Deléham, Nov 25 2008: (Start)

a(n) = 27*a(n-1); a(0)=3.

G.f.: 3/(1-27*x). (End)

Maple

seq(3^(3*n+1), n=0..15); # Nathaniel Johnston, Jun 26 2011

Mathematica

NestList[27#&, 3, 20] (* Harvey P. Dale, Apr 01 2018 *)

Prog

(Magma) [3^(3*n+1): n in [0..25]]; // Vincenzo Librandi, May 25 2011
(PARI) a(n)=3^(3*n+1) \\ Charles R Greathouse IV, Jul 11 2016

Crossrefs

Cf. A013730, A013733, A013734.

Sequence in context: A223187 A060851 A116179 * A292974 A209587 A223736

Adjacent sequences: A013729 A013730 A013731 * A013733 A013734 A013735

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved