A223072 Number of nX2 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, 62, 306, 2888, 17968, 139616, 928600, 6820956, 46372206, 331873366, 2268321228, 16088886806, 110434690210, 779564502166, 5364206977288, 37736564395518, 260073138117054, 1825634354645876, 12597507479843608, 88290795179492360

Offset

1,2

Comments

Column 2 of A223074

Links

R. H. Hardin, Table of n, a(n) for n = 1..33

Example

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

Crossrefs

Sequence in context: A100166 A100159 A100160 * A010746 A124995 A020191

Adjacent sequences: A223069 A223070 A223071 * A223073 A223074 A223075

Keyword

nonn

Author

R. H. Hardin Mar 14 2013

Status

approved