A203058 Number of n X n 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

1, 455, 3421817, 647485600638, 4668059982081633499, 1249342261879637139766649551

Offset

1,2

Comments

Diagonal of A203066

Links

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

Example

Some solutions for n=5
..2..6..3..0..0....4..2..2..6..4....2..3..3..5..2....3..4..4..3..6
..1..6..4..5..3....4..1..2..6..2....3..6..6..5..6....4..1..5..5..6
..4..6..2..5..6....2..5..0..6..6....0..5..2..6..6....6..2..1..4..5
..1..1..2..3..6....4..5..3..3..6....1..4..0..6..1....6..2..3..3..5
..0..6..6..0..6....6..6..0..4..4....4..4..1..6..2....4..0..4..4..1

Crossrefs

Sequence in context: A061544 A015276 A145528 * A116331 A099650 A265493

Adjacent sequences: A203055 A203056 A203057 * A203059 A203060 A203061

Keyword

nonn

Author

R. H. Hardin Dec 28 2011

Status

approved