A223307 Number of nX4 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.

36, 340, 12240, 221346, 8909352, 221358126, 8788947912, 255893927728, 10060028772840

Offset

1,1

Comments

Column 3 of A223309

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A053136 A000821 A250422 * A244795 A391636 A392441

Adjacent sequences: A223304 A223305 A223306 * A223308 A223309 A223310

Keyword

nonn

Author

R. H. Hardin, Mar 19 2013

Status

approved