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a(n) = 3^(5*n + 4).
2

%I #26 Sep 08 2022 08:44:38

%S 81,19683,4782969,1162261467,282429536481,68630377364883,

%T 16677181699666569,4052555153018976267,984770902183611232881,

%U 239299329230617529590083,58149737003040059690390169,14130386091738734504764811067

%N a(n) = 3^(5*n + 4).

%H Vincenzo Librandi, <a href="/A013829/b013829.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); a(0)=81.

%F G.f.: 81/(1-243*x). (End)

%F a(n) = A000244(A016897(n)). - _Wesley Ivan Hurt_, Sep 04 2022

%t NestList[243#&,81,12] (* _Harvey P. Dale_, Jan 23 2016 *)

%o (Magma) [3^(5*n+4): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011

%o (Maxima) makelist(3^(5*n+4),n,0,20); /* _Martin Ettl_, Oct 21 2012 */

%o (PARI) a(n)=3^(5*n+4) \\ _Charles R Greathouse IV_, Jul 11 2016

%Y Cf. A000244, A016897.

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_