A207229 Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal

3, 81, 5853, 2464241, 5437970705, 47274560618753, 1735838281998728881

Offset

1,1

Comments

Diagonal of A207235

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..1..2..2..2....1..2..2..2....2..2..2..1....2..1..1..1....1..1..1..0
..1..2..2..2....1..0..0..0....2..1..0..2....1..0..0..1....1..2..2..2
..1..2..2..1....0..1..2..2....0..0..0..0....0..2..0..0....0..2..2..2
..1..2..2..1....2..1..0..2....2..0..2..2....0..2..0..2....2..0..0..1

Crossrefs

Sequence in context: A209587 A223736 A355157 * A223717 A223825 A207222

Adjacent sequences: A207226 A207227 A207228 * A207230 A207231 A207232

Keyword

nonn

Author

R. H. Hardin Feb 16 2012

Status

approved