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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 0
18, 324, 12240, 195228, 4750550, 78948936, 1652577147, 27860306868, 553833204570, 9464178634560 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 20:39 EST 2021. Contains 349558 sequences. (Running on oeis4.)