A223311 Number of 3X(n+1) 0..2 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope

18, 324, 12240, 195228, 4750550, 78948936, 1652577147, 27860306868, 553833204570, 9464178634560

Offset

1,1

Comments

Row 3 of A223309

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A171292 A001027 A285875 * A041145 A041614 A222812

Adjacent sequences: A223308 A223309 A223310 * A223312 A223313 A223314

Keyword

nonn

Author

R. H. Hardin Mar 19 2013

Status

approved