A201800 Number of zero-sum nX5 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.

381, 28625, 562961, 20960485, 722587629, 27941324053, 1077779765471

Offset: 1

Author

R. H. Hardin Dec 05 2011

Keywords

• nonn

Comments

Column 5 of A201803

Examples

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