A203382 Number of n X n 0..6 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 7, 2422, 7951793, 307215779816

Offset

1,2

Comments

Diagonal of A203389

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A209591 A060759 A067504 * A249352 A264743 A210405

Adjacent sequences: A203379 A203380 A203381 * A203383 A203384 A203385

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved