A229840 Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j).

0, 15, 987, 453837, 1296261759, 23643209345079, 2745117942652795617

Offset: 1

Author

R. H. Hardin, Oct 01 2013

Keywords

• nonn

Comments

Diagonal of A229847

Examples

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