A203436 Number of n X n 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 8, 4124, 24278164, 1842430382222

Offset

1,2

Comments

Diagonal of A203443

Links

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

Example

Some solutions for n=5
..6..7..7..6..0....1..4..4..3..0....2..7..7..7..2....5..6..7..7..6
..6..7..7..6..1....4..4..7..7..3....6..7..0..7..6....7..7..7..7..6
..4..7..7..2..1....7..7..7..7..3....6..7..2..7..6....7..7..1..1..5
..1..3..1..6..6....7..1..1..7..4....2..7..2..7..0....5..2..2..0..5
..1..3..3..6..6....7..7..7..7..4....2..7..7..7..0....5..5..5..5..5

Crossrefs

Sequence in context: A013742 A209592 A060760 * A159368 A167065 A303895

Adjacent sequences: A203433 A203434 A203435 * A203437 A203438 A203439

Keyword

nonn

Author

R. H. Hardin Jan 01 2012

Status

approved