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A269828
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Number of nX7 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling four exactly once.
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1
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30720, 55265336, 65284613232, 71730749075588, 74936429415811576, 75641344262475714972, 74703200829032822656704, 72410184537396417428483772, 69247970979790014999193560760, 65469795278283248240466444354336
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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=1
..3..0..4..1..4..4..1. .1..1..2..4..4..0..3. .0..0..2..4..2..2..4
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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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