A203183 Number of n X n 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

1, 165, 263725, 6474088455, 3326678666649639, 34353493702738177260748, 6970324759861265041580630860421

Offset

1,2

Comments

Diagonal of A203191

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A176018 A184287 A233466 * A184128 A015982 A065210

Adjacent sequences: A203180 A203181 A203182 * A203184 A203185 A203186

Keyword

nonn

Author

R. H. Hardin Dec 30 2011

Status

approved