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A207284
Number of n X n 0..3 arrays avoiding the pattern z-2 z-1 z in any row or column
0
4, 256, 216952, 2663436930, 464024582705468, 1155689817715438142804, 41064557653205497965204017422, 20826195419129636302248989735404338974
OFFSET
1,1
COMMENTS
Diagonal of A207290
EXAMPLE
Some solutions for n=4
..0..2..2..1....2..2..1..0....1..3..2..1....0..1..0..3....1..3..0..1
..1..0..1..1....3..2..2..0....1..1..0..3....2..2..1..2....0..0..1..0
..3..2..1..0....2..3..0..0....2..3..3..0....1..1..3..2....0..1..1..3
..0..3..0..0....1..2..0..2....0..2..1..3....0..3..3..0....3..0..3..1
CROSSREFS
Sequence in context: A223579 A206832 A206894 * A229100 A060757 A136807
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 16 2012
STATUS
approved