A203339 Number of n X n 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 5, 635, 503409, 3742207236, 360171255368417

Offset

1,2

Comments

Diagonal of A203346

Links

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

Example

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

Crossrefs

Sequence in context: A060758 A348081 A256070 * A253690 A068421 A142535

Adjacent sequences: A203336 A203337 A203338 * A203340 A203341 A203342

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved