A213986 Number of n X n 0..4 matrices whose square is also a 0..4 matrix.

3, 72, 8168, 3510112, 5018010431

Offset: 1

Author

R. H. Hardin Jun 30 2012

Keywords

• nonn

Comments

Column 4 of A213990

Examples

			Some solutions for n=3
..0..4..1....0..4..4....0..4..4....2..0..0....1..0..2....0..3..2....2..2..0
..0..0..0....0..0..0....1..0..0....0..2..2....0..2..0....0..1..0....0..0..2
..0..1..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0