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%I #5 Mar 31 2012 12:36:45
%S 1,63,765,26003,559115,16513425,435630965,12576072219,355197660509,
%T 10318921933459,299385686951737,8776646594694357,257891661687979323,
%U 7614010950576116449,225337048658653360699,6687122593012508859001
%N Number of zero-sum nX3 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor
%C Column 3 of A201888
%H R. H. Hardin, <a href="/A201886/b201886.txt">Table of n, a(n) for n = 1..32</a>
%e Some solutions for n=4
%e ..2.-2.-1....2..2.-2...-1.-1.-1....1..1.-1....1..2..0....1.-2.-2....2.-1..2
%e ..2.-2.-1...-1.-1.-2....2..0..0...-1..0.-1....1..2..0....1..1.-2....2.-1..2
%e .-1..0..0...-1..1..1....2..2..0...-1..0..2...-2.-2..0....1..0..1...-2.-1..0
%e .-1..2..2...-1..1..1...-1.-1.-1...-1.-1..2...-1.-1..0....0..0..1...-2.-1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 06 2011
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