A206693 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row or column

3, 81, 15712, 23335217, 262482902920, 22540704363210913, 14777630573426014735558, 74010398585294927963749126971, 2831737193779046594636895038867701496

Offset

1,1

Comments

Diagonal of A206700

Links

R. H. Hardin, Table of n, a(n) for n = 1..10

Example

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

Crossrefs

Sequence in context: A355071 A207544 A207311 * A223570 A228971 A060722

Adjacent sequences: A206690 A206691 A206692 * A206694 A206695 A206696

Keyword

nonn

Author

R. H. Hardin Feb 11 2012

Status

approved