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A198181
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Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4
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1
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2, 8, 25, 59, 331, 883, 3485, 12030, 43774, 155664, 540628, 1936313, 6871687, 24471790, 86551688, 306708029, 1089956129, 3870392120, 13733968845, 48703981505, 172844148554, 613561265167, 2177517194687, 7726401450405
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OFFSET
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1,1
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COMMENTS
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Every 0 is next to 0 0's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's
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LINKS
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EXAMPLE
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Some solutions containing all values 0 to 4 for n=5
..0..1..2..1....1..2..1..0....1..2..1..0....0..1..1..2....1..0..1..2
..3..0..3..0....0..3..0..3....0..3..0..3....1..2..0..1....2..3..0..1
..0..4..0..1....3..0..4..0....1..0..4..0....1..0..4..0....1..0..4..0
..3..0..3..2....0..3..0..3....2..3..0..1....2..3..0..1....0..3..0..3
..0..3..0..1....1..2..1..0....1..0..1..2....1..0..1..2....1..2..1..0
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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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