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A269763
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Number of nX4 0..5 arrays with some element plus some horizontally or vertically adjacent neighbor totalling five exactly once.
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1
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450, 524160, 326697720, 170119348800, 81208264293720, 36821411380183680, 16136599337765506680, 6902518041829140001920, 2899610192068539725611800, 1201070898923243105905234560, 491952252969600904794435746040
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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) = 798*a(n-1) -180699*a(n-2) +8707236*a(n-3) -167225067*a(n-4) +1392360966*a(n-5) -4194764289*a(n-6) for n>7
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EXAMPLE
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Some solutions for n=1
..5..0..1..0. .5..0..0..3. .2..2..3..3. .5..0..0..0. .0..4..4..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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