A269508 Number of 4Xn arrays containing n copies of 0..4-1 avoiding the pattern down-up in every row and column.

8, 600, 18332, 480440, 13522204, 492613956, 18677195738, 753228526960, 29963202454514, 1236592684106800

Offset: 1

Author

R. H. Hardin, Feb 28 2016

Keywords

• nonn

Comments

Row 4 of A269505.

Examples

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

Crossrefs

Cf. A269505.