A185902 1/8 the number of nX5 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

15, 38731, 28967421, 32611077940, 30884279980274

Offset: 1

Author

R. H. Hardin Feb 06 2011

Keywords

• nonn

Comments

Column 5 of A185903

Examples

			Some solutions for 3X5 with a(1,1)=0
..0..4..0..0..4....0..0..6..6..6....0..0..0..2..6....0..0..6..6..0
..0..4..6..0..4....4..4..4..0..0....0..4..4..2..6....4..4..4..0..0
..0..4..6..0..4....0..0..4..5..5....0..0..4..2..6....4..0..0..7..7