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%I #21 Sep 08 2022 08:44:38
%S 400,3200000,25600000000,204800000000000,1638400000000000000,
%T 13107200000000000000000,104857600000000000000000000,
%U 838860800000000000000000000000,6710886400000000000000000000000000,53687091200000000000000000000000000000
%N a(n) = 20^(3*n + 2).
%H Vincenzo Librandi, <a href="/A013767/b013767.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 NestList[8000#&,400,10] (* _Harvey P. Dale_, May 11 2018 *)
%o (Magma) [20^(3*n+2): n in [0..10]]; // _Vincenzo Librandi_, Jun 27 2011
%o (PARI) a(n)=20^(3*n+2) \\ _Charles R Greathouse IV_, Jul 10 2016
%Y Subsequence of A009964.
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_
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