A213985 Number of n X n 0..3 matrices whose square is also a 0..3 matrix.

2, 36, 2546, 604639, 421195466, 801373175814

Offset: 1

Author

R. H. Hardin Jun 30 2012

Keywords

• nonn

Comments

Column 3 of A213990

Examples

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