A223306 Number of nX3 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.

9, 36, 324, 1845, 17343, 119660, 1139787, 8607060, 81980208, 654895692, 6214786587, 51174096165, 483028282800, 4058363367764, 38087602931007, 324428475860991, 3027965859096579, 26044772393542375, 242002470580757595

Offset

1,1

Comments

Column 2 of A223309

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A024120 A262782 A204513 * A272890 A129425 A246757

Adjacent sequences: A223303 A223304 A223305 * A223307 A223308 A223309

Keyword

nonn

Author

R. H. Hardin, Mar 19 2013

Status

approved