A251261 Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having x11-x00 less than x10-x01.

11, 114, 1667, 32636, 790734, 22806904, 760734085, 28749778264, 1212060756101, 56320777311152, 2856799572599106, 156942568859096170, 9277021941286520402, 586789114650518446860, 39528041606657916420501

Offset: 1

Author

R. H. Hardin, Dec 01 2014

Keywords

• nonn

Comments

Diagonal of A251268

Examples

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