%I #22 Sep 08 2022 08:44:38
%S 27,2187,177147,14348907,1162261467,94143178827,7625597484987,
%T 617673396283947,50031545098999707,4052555153018976267,
%U 328256967394537077627,26588814358957503287787,2153693963075557766310747
%N a(n) = 3^(4*n + 3).
%H Vincenzo Librandi, <a href="/A013779/b013779.txt">Table of n, a(n) for n = 0..200</a>
%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 From _Philippe Deléham_, Nov 25 2008: (Start)
%F a(n) = 81*a(n-1); a(0)=27.
%F G.f.: 27/(1-81*x). (End)
%t 3^(4*Range[0,20]+3) (* or *) NestList[81*#&,27,20] (* _Harvey P. Dale_, May 28 2019 *)
%o (Magma) [3^(4*n+3): n in [0..20]]; // _Vincenzo Librandi_, Jun 27 2011
%Y Subsequence of A000244.
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_
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