A204069 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.

8, 329, 45056, 19934369, 28864215128, 137884925726873, 2183735443548857744, 115025778364437876962225, 20195410108776255562409533352, 11837286998861556208797264551862761

Offset: 1

Author

R. H. Hardin Jan 10 2012

Keywords

• nonn

Comments

Diagonal of A204076

Examples

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