%I A009964
%S A009964 1,20,400,8000,160000,3200000,64000000,1280000000,25600000000,
%T A009964 512000000000,10240000000000,204800000000000,4096000000000000,
%U A009964 81920000000000000,1638400000000000000,32768000000000000000
%N A009964 Powers of 20.
%H A009964 T. D. Noe, <a href="b009964.txt">Table of n, a(n) for n=0..100</a>
%H A009964 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/
               RecursiveSequences.html">Recursive Sequences</a>
%F A009964 G.f.: 1/(1-20x), e.g.f.: exp(20x)
%o A009964 (Other) sage: [lucas_number1(n,20,0) for n in xrange(1, 17)]# [From Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Apr 29 2009]
%Y A009964 a(n) = A159991(n)/A000244(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               May 02 2009]
%Y A009964 Sequence in context: A019319 A083276 A057745 this_sequence A007577 A048987 
               A006494
%Y A009964 Adjacent sequences: A009961 A009962 A009963 this_sequence A009965 A009966 
               A009967
%K A009964 nonn,easy
%O A009964 0,2
%A A009964 N. J. A. Sloane (njas(AT)research.att.com).