A222950 Number of nX2 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, 212, 2256, 36302, 455904, 6471572, 84040156, 1156716696, 15178933676, 206025068636, 2712435820392, 36611998287306, 483144415956072, 6500119089674696, 85910716717515264, 1153267214849914148

Offset: 1

Author

R. H. Hardin Mar 10 2013

Keywords

• nonn

Comments

Column 2 of A222953

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..24