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A198007
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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 3,3,0,1,2 for x=0,1,2,3,4.
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0
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OFFSET
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1,2
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COMMENTS
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Every 0 is next to 0 3's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2's.
Diagonal of A198013.
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LINKS
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Table of n, a(n) for n=1..9.
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EXAMPLE
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Some solutions for n=4:
..2..0..0..0....0..1..3..1....0..0..1..0....2..0..0..2....0..0..0..0
..0..0..0..2....2..0..1..0....0..1..3..2....0..1..0..0....0..0..0..0
..0..0..0..2....2..0..2..0....0..0..1..0....2..3..1..2....0..0..1..0
..2..0..0..0....0..0..2..0....0..0..0..2....0..1..0..0....0..1..3..1
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CROSSREFS
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Sequence in context: A198087 A124271 A220224 * A156751 A352242 A138849
Adjacent sequences: A198004 A198005 A198006 * A198008 A198009 A198010
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Oct 20 2011
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STATUS
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approved
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