A203093 Number of n X n 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

1, 84, 48552, 308642476, 27467664499412, 32766523337754473494, 516228209623915573866603862, 107889416526594162925859037893676244

Offset: 1

Author

R. H. Hardin Dec 29 2011

Keywords

• nonn

Comments

Diagonal of A203101

Examples

			Some solutions for n=5
..1..1..3..3..0....3..3..2..0..2....3..2..3..3..2....0..2..1..0..1
..3..1..1..3..2....2..0..1..1..2....3..2..2..3..0....0..2..2..1..1
..3..1..1..0..3....3..1..1..3..1....0..0..3..0..0....3..1..0..1..0
..2..3..3..0..3....3..3..1..3..0....1..2..3..2..0....3..0..1..2..0
..2..1..3..2..0....1..2..0..0..0....1..2..0..3..3....3..3..0..2..0