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A197206
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Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,0,3 for x=0,1,2,3,4
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1
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9, 1601, 135560, 11746093, 1024514869, 89745742142, 7876891407951, 690021326042559, 60491817588808916, 5301646194878359081, 464649371771178476930, 40726185128716590636286, 3569576115816506857804441
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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 4'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 3's
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0..0..2..1..0..0....0..0..0..3..0..1..2....0..0..1..2..1..0..1
..0..0..0..1..0..0..0....0..0..0..0..3..0..1....0..0..0..3..0..3..2
..0..0..2..1..0..3..0....0..1..2..2..1..1..0....0..0..0..0..3..0..1
..0..0..1..1..2..1..0....0..0..1..1..0..2..1....0..0..0..0..1..2..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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