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%I #5 Mar 31 2012 12:36:46
%S 51,1593,19541,359017,6221993,119412837,2229078023,43322352587,
%T 834780981463,16419276700137,322292535850539,6395286541286533,
%U 126942458619056105,2535214795070175713,50692230117983107173
%N Number of zero-sum nX5 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors
%C Column 5 of A202047
%H R. H. Hardin, <a href="/A202044/b202044.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for n=3
%e .-1..0..0..0..1...-1.-1..1.-1.-1....1..1..0..0..1...-1..1.-1.-1.-1
%e ..1..1..1..0..0....1..1..1..0..0...-1.-1.-1..0..0...-1..1..1..1..1
%e .-1.-1..1.-1.-1....1..0..0..0.-1....1..1.-1..0.-1....1..1.-1.-1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 10 2011
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