| DATA
|
6, 30, 130, 534, 2230, 9310, 38870, 162278, 677510, 2828606, 11809446, 49304494, 205846518, 859410282, 3588042398, 14980095674, 62541977366, 261113080850, 1090148470882, 4551375536978, 19002016543538, 79333517919430
|
| EXAMPLE
|
Some solutions for n=7
..1..0..1..2....0..1..0..1....1..2..1..0....2..0..1..2....2..1..2..1
..2..1..0..1....1..2..1..2....0..1..0..2....0..2..0..1....1..2..1..0
..1..2..1..0....2..1..2..1....1..0..2..1....1..0..1..0....2..1..2..1
..2..0..2..1....1..0..1..2....2..1..0..2....2..1..2..1....1..2..1..0
..0..1..0..2....2..1..0..1....1..2..1..0....0..2..1..2....2..1..2..1
..1..2..1..0....1..2..1..2....2..1..2..1....1..0..2..1....1..2..1..0
..2..1..0..2....0..1..2..1....1..0..1..2....2..1..0..2....0..1..2..1
|