A207195 Number of n X n 0..2 arrays avoiding the pattern z-1 z-1 z in any row or column.

3, 81, 12534, 12539372, 82169395789, 3560964505762489, 1025697542018363494742, 1959801984026721315634303343

Offset

1,1

Comments

Diagonal of A207201.

Links

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

Example

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

Crossrefs

Cf. A207201.

Sequence in context: A206726 A207352 A207983 * A207215 A355071 A207544

Adjacent sequences: A207192 A207193 A207194 * A207196 A207197 A207198

Keyword

nonn

Author

R. H. Hardin, Feb 15 2012

Status

approved