A185538 1/6 the number of nX5 0..5 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

11, 12105, 4403225, 2241330570, 994633804270, 468362874353295

Offset: 1

Author

R. H. Hardin Jan 30 2011

Keywords

• nonn

Comments

Column 5 of A185540

Examples

			Some solutions for 3X5 with a(1,1)=0
..0..0..0..4..4....0..0..3..3..5....0..0..0..3..4....0..0..0..0..1
..0..3..3..2..4....3..3..4..3..5....0..3..1..3..4....0..3..2..1..1
..0..0..0..2..2....0..0..4..4..5....0..3..1..5..5....0..3..2..5..5