A203049 Number of n X n 0..5 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

1, 286, 1055370, 78243755382, 168179371998322692, 10124772353743869083346802

Offset

1,2

Comments

Diagonal of A203057

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A130433 A140926 A295447 * A306788 A259402 A157997

Adjacent sequences: A203046 A203047 A203048 * A203050 A203051 A203052

Keyword

nonn

Author

R. H. Hardin Dec 28 2011

Status

approved