A201801 Number of zero-sum nX6 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.

1751, 235827, 7099021, 472565771, 27941324053

Offset: 1

Author

R. H. Hardin Dec 05 2011

Keywords

• nonn

Comments

Column 6 of A201803

Examples

			Some solutions for n=2
.-1.-1..2..2.-1..2...-1..0.-1..2.-2..1...-2.-2.-2..0..0..2....0.-2..1..1..2..2
.-2.-2..2..2.-1.-2....2..0.-1..2.-2..0....2.-1.-1..1..1..2...-2.-2.-2..1..2.-1