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A269898
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Number of nX4 0..6 arrays with some element plus some horizontally or vertically adjacent neighbor totalling six exactly once.
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1
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756, 2005080, 2801265390, 3263186052840, 3482459146452300, 3529041005211929340, 3455975332370347120110, 3303146124421034482402560, 3100239092232761916959997090, 2869073024662771484873107165380
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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) = 1746*a(n-1) -838311*a(n-2) +67282834*a(n-3) -2128326885*a(n-4) +29556635268*a(n-5) -150523824676*a(n-6) for n>7
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EXAMPLE
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Some solutions for n=1
..4..5..1..0. .0..0..0..6. .3..3..5..6. .2..3..3..6. .0..2..3..3
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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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