%I #16 Sep 08 2022 08:44:38
%S 20,3200000,512000000000,81920000000000000,13107200000000000000000,
%T 2097152000000000000000000000,335544320000000000000000000000000,
%U 53687091200000000000000000000000000000,8589934592000000000000000000000000000000000
%N a(n) = 20^(4*n+1).
%H Vincenzo Librandi, <a href="/A013812/b013812.txt">Table of n, a(n) for n = 0..100</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 (160000).
%F a(n) = 160000*a(n-1). - _Harvey P. Dale_, Dec 30 2012
%p A013812:=n->20^(4*n+1): seq(A013812(n), n=0..10); # _Wesley Ivan Hurt_, Mar 31 2017
%t 20^(4*Range[0,10]+1) (* or *) NestList[160000#&,20,10] (* _Harvey P. Dale_, Dec 30 2012 *)
%o (Magma) [20^(4*n+1): n in [0..15]]; // _Vincenzo Librandi_, Jul 06 2011
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_