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A270057
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Number of nX7 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.
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1
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30720, 414705720, 3230189811360, 21244602958557060, 128543872461556329960, 739963061540157663852060, 4120579270516550893026428880, 22408736961354610893755135234040, 119718109679183490800236571685026760
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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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FORMULA
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Empirical recurrence of order 64 (see link above)
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EXAMPLE
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Some solutions for n=1
..2..3..3..0..3..2..2. .4..2..2..0..1..1..0. .4..2..3..2..0..3..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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