| DATA
|
2616, 9209, 38392, 167637, 637570, 2228050, 7570126, 24603175, 77699926, 240604963, 731676813, 2193193398, 6506008066, 19128153912, 55819067155, 161889609500, 467100675752, 1341818201946, 3840365573161, 10956834925946
|
| EXAMPLE
|
Some solutions for n=4
..0..0..0..0....0..1..1..0....0..0..0..1....0..0..1..0....0..0..0..0
..0..0..0..1....0..0..0..1....1..1..1..0....0..1..0..0....0..0..0..0
..0..0..0..0....0..0..1..1....0..0..0..0....0..1..0..1....0..1..0..0
..1..1..1..1....1..1..1..1....0..1..0..0....1..1..0..0....0..0..0..1
..1..0..0..1....0..1..1..1....0..1..0..1....0..0..0..1....1..1..1..0
..0..0..0..1....1..1..1..1....1..0..1..1....0..1..1..1....0..0..0..1
|