A206572 Number of nX3 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal

61, 3721, 188699, 9509750, 478456896, 24071410239, 1211164182464, 60940227961282, 3066196250895643, 154274761365491709, 7762277323583045839, 390556037506212530634, 19650677663071356937032, 988716329728016793029948

Offset

1,1

Comments

Column 3 of A206577

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A206969 A206792 A206962 * A207577 A209087 A207052

Adjacent sequences: A206569 A206570 A206571 * A206573 A206574 A206575

Keyword

nonn

Author

R. H. Hardin Feb 09 2012

Status

approved