A222951 Number of nX3 0..3 arrays with no adjacent rows or columns having the same least squares slope fit to a straight line, with a single point array taken as having zero slope.

0, 2256, 125664, 8579208, 436075392, 25670781880, 1318401732192, 74325398290456, 3851979765811744, 213021713761427836, 11107559755380176496, 607834111663512093200, 31825816417857647397600, 1730405083684853119755316

Offset: 1

Author

R. H. Hardin Mar 10 2013

Keywords

• nonn

Comments

Column 3 of A222953

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15