A202908 Number of n X n 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

1, 680, 9509536, 4062408076312, 83625724607330716008, 81642366196089406720417732740

Offset

1,2

Comments

Diagonal of A202916

Links

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

Example

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

Crossrefs

Sequence in context: A154036 A185765 A206015 * A309245 A118509 A043691

Adjacent sequences: A202905 A202906 A202907 * A202909 A202910 A202911

Keyword

nonn

Author

R. H. Hardin Dec 26 2011

Status

approved