A222958 Number of nX7 0..1 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope.

20, 20, 400, 400, 8000, 8000, 323600, 215892, 14843920, 9734400, 1138729280, 631004724, 117308595520, 59768363024, 14742894291200, 7399937947392, 2167430898315280, 1074761911462928, 361218009407664960

Offset: 1

Author

R. H. Hardin Mar 10 2013

Keywords

• nonn

Comments

Column 7 of A222959

Examples

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