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20^(3n+1).
1

%I #24 Sep 08 2022 08:44:38

%S 20,160000,1280000000,10240000000000,81920000000000000,

%T 655360000000000000000,5242880000000000000000000,

%U 41943040000000000000000000000,335544320000000000000000000000000,2684354560000000000000000000000000000

%N 20^(3n+1).

%H Vincenzo Librandi, <a href="/A013766/b013766.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 (8000).

%t 20^(3Range[0,10]+1) (* _Harvey P. Dale_, Jun 23 2011 *)

%o (Magma) [20^(3*n+1): n in [0..10]]; // _Vincenzo Librandi_, Jun 27 2011

%o (Maxima) makelist(20^(3*n+1),n,0,20); /* _Martin Ettl_, Oct 21 2012 */

%o (PARI) a(n)=20^(3*n+1) \\ _Charles R Greathouse IV_, Jul 10 2016

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_