A206569 Number of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal

4, 256, 188699, 1665431164, 176372042982658, 224922074723556223280

Offset

1,1

Comments

Diagonal of A206577

Links

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

Example

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

Crossrefs

Sequence in context: A206968 A206789 A206961 * A207576 A209086 A207051

Adjacent sequences: A206566 A206567 A206568 * A206570 A206571 A206572

Keyword

nonn

Author

R. H. Hardin Feb 09 2012

Status

approved