A213989 Number of n X n 0..7 matrices whose square is also a 0..7 matrix.

3, 148, 40370, 56599992, 361204218672

Offset: 1

Author

R. H. Hardin Jun 30 2012

Keywords

• nonn

Comments

Column 7 of A213990

Examples

			Some.solutions.for.n=3
..0..1..7....0..5..3....0..2..1....0..1..7....0..2..5....2..0..0....0..7..0
..0..0..5....0..0..0....0..0..0....0..0..2....0..0..0....0..1..1....0..1..0
..0..0..0....0..0..0....0..3..2....0..0..0....0..0..1....0..0..1....0..6..0