A199125 Number of n X n 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor.

1, 2, 6, 258, 11475, 438502, 358599045, 247746055048, 141388449764548

Offset: 1

Author

R. H. Hardin Nov 03 2011

Keywords

• nonn

Comments

Diagonal of A199133

Examples

			Some solutions for n=5
..0..1..0..1..0....0..1..2..1..2....0..1..2..1..2....0..1..0..2..1
..2..0..1..0..2....2..0..1..0..1....1..2..1..2..0....1..0..2..0..2
..1..2..0..2..1....0..2..0..1..2....2..0..2..0..1....0..2..1..2..1
..0..1..2..1..2....1..0..2..0..1....0..2..1..2..0....1..0..2..1..0
..1..2..0..2..1....2..1..0..2..0....1..0..2..0..1....0..2..1..0..2