A223073 Number of nX3 0..2 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, 306, 7074, 207216, 4047876, 97159620, 1928081520, 43509150044, 873828163878, 19208528576854, 389079560250324, 8428330075480050, 171707154474046338, 3686377068301662354, 75409883058327101568, 1609394321785721896586

Offset

1,2

Comments

Column 3 of A223074

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A030030 A206679 A172966 * A064257 A221854 A221724

Adjacent sequences: A223070 A223071 A223072 * A223074 A223075 A223076

Keyword

nonn

Author

R. H. Hardin Mar 14 2013

Status

approved