A203543 Number of n X n 0..4 arrays with every nonzero element less than or equal to some NW, E or S neighbor.

1, 25, 32920, 276550270, 33466433693229, 72614149907378126398, 2637221656906543119366072476, 1479737300994461631995281660020138894

Offset

1,2

Comments

Diagonal of A203550.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
..3..0..1..3..2....1..4..2..2..3....1..0..4..0..3....0..1..3..4..4
..3..2..1..3..4....0..4..3..1..4....1..0..4..0..3....2..0..1..1..4
..3..1..4..2..4....1..4..3..3..4....3..2..4..3..3....2..2..3..4..0
..3..4..4..4..4....3..4..2..4..4....4..3..4..2..3....1..2..3..4..2
..4..4..4..3..4....3..4..4..3..4....4..4..4..4..0....4..4..4..4..4

Crossrefs

Cf. A203550.

Sequence in context: A082211 A053766 A298467 * A337727 A034711 A325215

Adjacent sequences: A203540 A203541 A203542 * A203544 A203545 A203546

Keyword

nonn

Author

R. H. Hardin Jan 02 2012

Status

approved