A240643 Number of n X n 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order.

0, 2, 6, 18, 232, 5304, 227270, 18030130, 2764522654, 770199142784

Offset: 1

Author

R. H. Hardin, Apr 09 2014

Keywords

• nonn

Comments

Diagonal of A240649

Examples

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