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A269274
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Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
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1
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1620, 1104264, 474819408, 174924572760, 59587625651904, 19356924219624936, 6090616046325570480, 1872977567099580289656, 566116324214731470647712, 168820920854627863029497352, 49802534018235803452666079376
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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: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) +76236552*a(n-5) -92236816*a(n-6) for n>7
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EXAMPLE
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Some solutions for n=2
..0..0..1..0..2..1. .0..0..0..2..3..1. .0..0..2..2..3..1. .0..0..1..2..0..2
..2..0..2..0..1..3. .2..0..3..3..1..3. .1..0..2..0..0..0. .1..1..0..1..3..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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