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

%I #19 Sep 08 2022 08:44:38

%S 20,64000000,204800000000000,655360000000000000000,

%T 2097152000000000000000000000,6710886400000000000000000000000000,

%U 21474836480000000000000000000000000000000,68719476736000000000000000000000000000000000000,219902325555200000000000000000000000000000000000000000

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

%H Vincenzo Librandi, <a href="/A013894/b013894.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)=20. - _Vincenzo Librandi_, May 27 2011

%o (Magma) [20^(5*n+1): n in [0..10]]; // _Vincenzo Librandi_, May 27 2011

%Y Cf. A009964.

%K nonn

%O 0,1

%A _N. J. A. Sloane_