A201801 - OEIS

%I #4 Mar 31 2012 12:36:45

%S 1751,235827,7099021,472565771,27941324053

%N Number of zero-sum nX6 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors

%C Column 6 of A201803

%e Some solutions for n=2

%e .-1.-1..2..2.-1..2...-1..0.-1..2.-2..1...-2.-2.-2..0..0..2....0.-2..1..1..2..2

%e .-2.-2..2..2.-1.-2....2..0.-1..2.-2..0....2.-1.-1..1..1..2...-2.-2.-2..1..2.-1

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 05 2011