%I #14 Jan 25 2020 01:41:55
%S 81,6561,531441,43046721,3486784401,282429536481,22876792454961,
%T 1853020188851841,150094635296999121,12157665459056928801,
%U 984770902183611232881,79766443076872509863361,6461081889226673298932241,523347633027360537213511521
%N a(n) = 3^(4n).
%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (81).
%F a(n) = 81^n.
%F G.f.: 81*x/(1-81*x). - _Philippe Deléham_, Nov 25 2008
%t 3^(4*Range[20]) (* or *) NestList[81#&,81,20] (* _Harvey P. Dale_, Apr 09 2012 *)
%Y Cf. A000244, A001019, A009971.
%K nonn
%O 1,1
%A Douglas Winston (douglas.winston(AT)srupc.com), Jan 05 2004
%E More terms from _Harvey P. Dale_, Apr 09 2012