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%I #5 Mar 31 2012 12:36:46
%S 577,15751,101395,490879,1519417,4460689,9882793,21851983,40831435,
%T 77490037,129389941,219474487,336880639,536126239,777338533,
%U 1152674479,1605065239,2301180355,3090983005,4236736987,5528432323,7416995779
%N Number of -n..n circular arrays x(0..8) of 9 elements with zero sums of x(i) and x(i)*x((i+1) mod 9)
%C Row 7 of A202006
%H R. H. Hardin, <a href="/A202011/b202011.txt">Table of n, a(n) for n = 1..24</a>
%e Some solutions for n=1
%e ..1....1....0....0....0....0...-1....0...-1...-1....0....0....1....1....1....0
%e ..0....0...-1...-1....0....1...-1...-1...-1....1....1....1....0....0....1....1
%e .-1....1....0....0...-1....0....0....1....1....0....1....0...-1....0...-1....0
%e ..0...-1...-1....1....1....0....1....1....1....0...-1....0....1...-1....0....0
%e .-1....0....0....1...-1....0...-1....0....0...-1...-1....0...-1....1....0...-1
%e ..0....0....1...-1...-1....0....1....0....0...-1....0....0...-1....1...-1....0
%e ..1...-1....0....0....0....1....1....0....1....1...-1....0....0...-1...-1....0
%e ..0...-1....0....0....1...-1....0....0...-1....1....1...-1....0...-1....1....0
%e ..0....1....1....0....1...-1....0...-1....0....0....0....0....1....0....0....0
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 07 2011