A204972 Number of n X n 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..2 introduced in row major order.

1, 14, 1217, 451468, 594430765, 2924321664147

Offset: 1

Author

R. H. Hardin Jan 21 2012

Keywords

• nonn

Comments

Diagonal of A204978

Examples

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