A268247 Number of 3Xn 0..n arrays with every repeated value in every row greater than or equal to, and every column greater than, the previous repeated value.

6, 576, 216000, 197555340, 371713931400, 1257212773492866, 6967515866907769668, 59102884914387317492904, 728462977173724674571341120, 12523133152298313854607312469836

Offset: 1

Author

R. H. Hardin, Jan 29 2016

Keywords

• nonn

Comments

Row 3 of A268246.

Examples

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

Crossrefs

Cf. A268246.