A203499 Number of n X n 0..6 arrays with every nonzero element less than or equal to some NW, E or S neighbor.

1, 49, 296814, 17549687172, 22732800433168401, 915339495505231856501713

Offset

1,2

Comments

Diagonal of A203506.

Links

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

Example

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

Crossrefs

Cf. A203506.

Sequence in context: A351443 A239169 A134725 * A013843 A303146 A023936

Adjacent sequences: A203496 A203497 A203498 * A203500 A203501 A203502

Keyword

nonn

Author

R. H. Hardin, Jan 02 2012

Status

approved