A205407 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order.

468, 44596, 10331386, 2839359056, 2520131261396

Offset: 1

Author

R. H. Hardin Jan 26 2012

Keywords

• nonn

Comments

Diagonal of A205415

Examples

			Some solutions for n=3
..0..1..1..1..1....0..0..0..0..0....0..0..0..1..0....0..0..1..0..0
..1..1..2..2..1....0..1..2..2..1....2..2..1..1..0....2..1..1..1..0
..1..1..1..2..1....0..2..2..2..2....1..1..1..1..1....1..1..1..2..0
..1..2..2..2..1....0..0..2..1..0....1..0..1..0..0....2..0..1..2..0
..0..0..0..2..1....0..2..2..0..1....2..1..1..2..2....0..0..1..1..0