A204698 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order.

1, 14, 1417, 835135, 2389914827, 34925753412578, 2568926644225402978, 954699753721419299486986

Offset: 1

Author

R. H. Hardin Jan 18 2012

Keywords

• nonn

Comments

Diagonal of A204705

Examples

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