| DATA
|
5, 19, 71, 260, 966, 3581, 13275, 49209, 182422, 676247, 2506882, 9293135, 34450119, 127708318, 473421137, 1754995884, 6505857719, 24117540693, 89404932324, 331428565852, 1228622307611, 4554564483230, 16883998852534, 62589830114818
|
| EXAMPLE
|
Some solutions for n=7
..1..1..1. .0..1..0. .0..0..1. .0..1..0. .0..0..1. .1..1..1. .1..0..0
..1..1..0. .1..1..0. .0..1..1. .1..1..0. .0..0..0. .1..1..0. .0..0..0
..1..0..0. .0..0..0. .1..1..1. .0..0..0. .1..1..0. .1..0..0. .1..0..1
..0..0..0. .0..1..1. .0..0..0. .0..0..1. .1..0..0. .0..1..0. .0..1..1
..1..0..0. .0..1..0. .0..0..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0
..0..1..0. .1..1..0. .0..1..1. .0..0..1. .0..0..0. .1..0..1. .0..0..0
..0..0..1. .0..0..0. .0..1..0. .0..1..1. .0..0..1. .0..0..0. .1..0..1
|