A089683 a(n) = 3^(4n).

81, 6561, 531441, 43046721, 3486784401, 282429536481, 22876792454961, 1853020188851841, 150094635296999121, 12157665459056928801, 984770902183611232881, 79766443076872509863361, 6461081889226673298932241, 523347633027360537213511521

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (81).

Formula

a(n) = 81^n.

G.f.: 81*x/(1-81*x). - Philippe Deléham, Nov 25 2008

Mathematica

3^(4*Range[20]) (* or *) NestList[81#&, 81, 20] (* Harvey P. Dale, Apr 09 2012 *)

Crossrefs

Cf. A000244, A001019, A009971.

Sequence in context: A223572 A188872 A217997 * A183506 A099372 A036515

Adjacent sequences: A089680 A089681 A089682 * A089684 A089685 A089686

Keyword

nonn

Author

Douglas Winston (douglas.winston(AT)srupc.com), Jan 05 2004

Extensions

More terms from Harvey P. Dale, Apr 09 2012

Status

approved