A238316 Number of (n+1)X(n+1) 0..2 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.

3, 67, 4294, 721939, 459256128, 1266938409578, 13394202897232848, 504070949140994691397

Offset

1,1

Comments

Diagonal of A238323

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A342505 A186208 A217625 * A182367 A091872 A079320

Adjacent sequences: A238313 A238314 A238315 * A238317 A238318 A238319

Keyword

nonn

Author

R. H. Hardin, Feb 24 2014

Status

approved