A222897 Number of n X n 0..1 arrays with successive rows and columns fitting to straight lines with strictly increasing slope, with a single point array taken as having zero slope

2, 5, 8, 251, 1872, 720452, 33675352

Offset

1,1

Comments

Diagonal of A222898

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..1..1..0..0....1..1..0..0....1..0..0..0....1..1..0..0....1..1..0..0
..0..0..0..0....1..0..0..0....0..0..0..0....0..1..0..0....1..0..0..0
..0..1..0..1....0..1..1..0....1..0..1..1....0..0..0..0....1..1..0..1
..0..1..1..1....0..0..0..1....0..0..0..1....0..1..0..1....0..1..1..1

Crossrefs

Sequence in context: A061354 A162709 A242875 * A282455 A323457 A011039

Adjacent sequences: A222894 A222895 A222896 * A222898 A222899 A222900

Keyword

nonn

Author

R. H. Hardin Mar 08 2013

Status

approved