A213993 Number of 4X4 0..n matrices whose square is also a 0..n matrix.

6327, 120133, 604639, 3510112, 9131098, 29365738, 56599992, 127113628, 255379242, 499365458, 784233528, 1531915046, 2261261860, 3473439982, 5267581848, 8552671195, 11581885709, 17881607889, 23603815011, 34808081571

Offset: 1

Author

R. H. Hardin Jun 30 2012

Keywords

• nonn

Comments

Row 4 of A213990

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..40