A203978 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.

6, 144, 7776, 956448, 271918944, 180709558848, 281455764775776, 1031010515432951328, 8894627860916158754400, 180980943906416856129607680

Offset: 1

Author

R. H. Hardin Jan 09 2012

Keywords

• nonn

Comments

Diagonal of A203984

Examples

			Some solutions for n=4
..0..1..0..2..1....0..1..1..1..1....0..0..0..1..1....0..0..0..0..1
..2..1..0..2..0....2..2..2..2..0....2..2..2..2..2....1..1..1..2..1
..0..1..0..2..0....1..0..1..1..0....0..0..0..0..1....0..0..0..0..0
..2..1..0..1..1....1..0..2..2..2....1..1..1..2..1....1..2..1..1..1
..2..1..0..2..2....1..0..1..0..1....0..2..0..2..0....1..2..0..2..2