%I #24 Sep 08 2022 08:44:38
%S 9,2187,531441,129140163,31381059609,7625597484987,1853020188851841,
%T 450283905890997363,109418989131512359209,26588814358957503287787,
%U 6461081889226673298932241,1570042899082081611640534563
%N a(n) = 3^(5*n + 2).
%H Vincenzo Librandi, <a href="/A013827/b013827.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 (243).
%F From _Philippe Deléham_, Nov 26 2008: (Start)
%F a(n) = 243*a(n-1), n > 0; a(0)=9.
%F G.f.: 9/(1-243*x).
%F a(n) = 3*A013826(n). (End)
%t 3^(5*Range[0,20]+2) (* or *) NestList[243#&,9,20] (* _Harvey P. Dale_, Feb 05 2020 *)
%o (Magma) [3^(5*n+2): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011
%o (PARI) a(n)=3^(5*n+2) \\ _Charles R Greathouse IV_, Jul 11 2016
%Y Cf. A000244 (3^n), A016873 (5*n+2).
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_