A207311 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal

3, 81, 15390, 21162579, 205235353935, 14121763303437256, 6886304943923084187412, 23820527297958550757568717516, 584573521981314585923770355820671056

Offset

1,1

Comments

Diagonal of A207317

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A207215 A355071 A207544 * A206693 A223570 A228971

Adjacent sequences: A207308 A207309 A207310 * A207312 A207313 A207314

Keyword

nonn

Author

R. H. Hardin Feb 16 2012

Status

approved