A196011 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors within one of itself.

1, 1, 2, 25, 106, 708, 22711, 670449, 44864449, 5122273171, 1106078073333, 426788297174150

Offset: 1

Author

R. H. Hardin Sep 26 2011

Keywords

• nonn

Comments

Diagonal of A196017

Examples

			Some solutions for n=4
..2..3..2..2....2..3..2..0....0..2..3..2....0..2..2..2....2..2..3..2
..3..3..0..2....3..4..3..2....2..3..4..3....2..3..0..2....2..0..3..3
..3..4..3..2....2..3..0..2....2..0..3..2....3..4..3..2....2..3..4..3
..2..3..2..0....0..2..2..2....2..2..2..0....2..3..2..0....0..2..3..2