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A196803
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Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,3,0,1 for x=0,1,2,3,4.
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0
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OFFSET
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1,3
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COMMENTS
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Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 1's.
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..0..0....0..0..1..0....0..3..0..0....0..1..0..0....0..3..0..0
..0..3..0..0....0..3..2..0....0..0..0..0....0..2..3..0....0..0..3..0
..1..2..3..0....3..0..3..0....3..0..0..3....0..3..0..3....0..0..3..0
..0..0..0..0....0..3..0..0....0..0..0..0....0..0..0..0....0..3..0..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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