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a(n) = 20^(5*n + 3).
1

%I #21 Sep 08 2022 08:44:38

%S 8000,25600000000,81920000000000000,262144000000000000000000,

%T 838860800000000000000000000000,2684354560000000000000000000000000000,

%U 8589934592000000000000000000000000000000000,27487790694400000000000000000000000000000000000000

%N a(n) = 20^(5*n + 3).

%H Vincenzo Librandi, <a href="/A013896/b013896.txt">Table of n, a(n) for n = 0..50</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 (3200000).

%F a(n) = 3200000*a(n-1), a(0)=8000. - _Vincenzo Librandi_, May 27 2011

%t 20^(5Range[0,20]+3) (* or *) NestList[3200000#&,8000,20] (* _Harvey P. Dale_, Dec 05 2021 *)

%o (Magma) [20^(5*n+3): n in [0..10]]; // _Vincenzo Librandi_, May 27 2011

%Y Cf. A009964.

%K nonn

%O 0,1

%A _N. J. A. Sloane_