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A196921
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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 1,3,2,4,0 for x=0,1,2,3,4
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1
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1, 13, 121, 1003, 11843, 123261, 1272060, 13167317, 137002955, 1435498461, 15112707121, 159542157831, 1687279432202, 17865758424479, 189328499039498, 2007534176165707, 21295364228486167, 225957961165658372
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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 3's, every 2 is next to 2 2's, every 3 is next to 3 4'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 for n=4
..0..0..0..0..0..0..0....2..2..2..0..0..0..0....0..2..2..2..0..0..0
..0..0..0..0..0..0..0....2..0..2..0..0..0..0....0..2..0..2..0..0..0
..0..0..0..0..0..0..0....2..0..2..0..2..2..0....0..2..0..2..0..4..0
..0..0..0..0..0..0..0....2..2..2..0..2..2..0....0..2..2..2..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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