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A209087
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Number of n X 3 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.
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1
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61, 3721, 196916, 10347649, 544875737, 28698007940, 1511450744648, 79603803814415, 4192507425158897, 220807551277341423, 11629311263707252062, 612483037985935327094, 32257754889454936954747, 1698925008894729788416226
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..2..0..3....0..3..3....1..0..2....1..0..0....1..1..0....3..2..2....1..3..3
..0..2..0....0..1..3....3..2..1....0..0..3....3..2..3....0..2..3....1..1..3
..3..1..1....2..1..1....1..0..3....2..2..1....3..0..0....3..0..1....0..1..1
..2..0..2....2..1..1....3..0..1....0..1..3....2..1..3....2..3..3....0..1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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