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A195967
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Number of nX6 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself
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1
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2, 2, 25, 118, 417, 746, 2906, 10899, 31616, 88860, 304443, 1013184, 3033869, 9608917, 30808108, 97784400, 307889267, 971517454, 3088012323, 9793418941, 30915299775, 97797652156, 310274504503, 981649179185, 3105621771879
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..1..1..0..1..1..0....2..2..2..0..1..1....0..2..2..2..2..2....2..2..2..2..2..0
..0..2..2..2..2..2....2..0..2..2..2..0....1..2..0..1..1..2....2..1..1..0..2..2
..1..2..1..1..0..2....2..1..1..0..2..1....1..2..2..2..0..2....2..2..2..2..0..2
..1..2..2..2..2..2....2..2..2..2..2..1....0..1..1..2..2..2....1..1..0..2..2..2
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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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