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A196577
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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 1,2,3,0,4 for x=0,1,2,3,4
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1
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1, 99, 1168, 24837, 543386, 10178170, 209244430, 4167002491, 83787848176, 1681864142052, 33715043534659, 676668917550412, 13575612361397730, 272363323225958600, 5464598861897357432, 109637123653049520937
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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 1'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 4's
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..3..0..0..0..0..0....0..3..0..0..3..0..0....0..0..3..0..0..3..0
..0..0..0..0..0..0..3....0..0..0..3..0..0..3....0..0..0..0..3..0..3
..0..0..3..3..0..0..0....3..0..0..2..3..0..0....0..0..0..0..3..0..0
..0..0..0..0..0..3..0....0..3..0..0..0..3..0....0..0..0..3..0..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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