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A267165
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Number of 4 X n arrays containing n copies of 0..4-1 with no element 1 greater than its west, southwest or northwest neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 8, 260, 5826, 66670, 1168252, 31032592, 668814194, 12704325536, 268426296628, 6190148621390, 138489274808162, 3029996476900546, 68316028731518380, 1579464310919005876, 36414866362521221012, 837970629282115803146
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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
..0..0..2..1....0..3..3..1....0..0..3..1....0..2..1..0....0..3..1..1
..2..0..3..2....1..0..2..2....2..0..2..1....3..2..1..0....0..3..1..1
..1..0..3..1....1..3..2..1....1..0..3..2....3..3..2..1....3..2..2..0
..2..1..3..3....0..3..2..0....2..1..3..3....1..3..2..0....3..2..0..2
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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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