A206726 Number of n X n 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal

3, 81, 11804, 9974630, 48956655199, 1435005981948541, 253106740389132162761

Offset

1,1

Comments

Diagonal of A206734

Links

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

Example

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

Crossrefs

Sequence in context: A207202 A206856 A206951 * A207352 A207983 A207195

Adjacent sequences: A206723 A206724 A206725 * A206727 A206728 A206729

Keyword

nonn

Author

R. H. Hardin Feb 11 2012

Status

approved