A240887 Number of n X n 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.

1, 4, 57, 2362, 245268, 64074526, 41971040844, 69012323813116, 284711573170326892

Offset: 1

Author

R. H. Hardin, Apr 14 2014

Keywords

• nonn

Comments

Diagonal of A240893

Examples

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