%I #4 Mar 31 2012 12:36:46
%S 393,37311,1067983,49553277,2229078023,108356007319
%N Number of zero-sum nX7 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors
%C Column 7 of A202047
%e Some solutions for n=2
%e ..1.-1.-1..1.-1.-1..1...-1.-1..1.-1..1..0.-1....0.-1.-1..0..1.-1.-1
%e .-1..1..1..1..1.-1.-1....0..0..1.-1..1..0..1....1..1..0..0..1..1.-1
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 10 2011