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A303318
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Number of 6Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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32, 14, 34, 165, 349, 1221, 7096, 30280, 102683, 403872, 1783894, 7248640, 27856927, 111871711, 461547267, 1859721535, 7397094062, 29793428041, 120739708314, 486065859963, 1951092593903, 7859276232228, 31701254570200, 127635189909079
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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) = a(n-1) +3*a(n-2) +18*a(n-3) +87*a(n-4) +23*a(n-5) -149*a(n-6) -305*a(n-7) -678*a(n-8) -45*a(n-9) +981*a(n-10) +937*a(n-11) +1834*a(n-12) +317*a(n-13) -1968*a(n-14) -1457*a(n-15) -2157*a(n-16) -964*a(n-17) +830*a(n-18) +254*a(n-19) +161*a(n-20) +152*a(n-21) -15*a(n-22) -3*a(n-23) for n>28
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EXAMPLE
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Some solutions for n=5
..0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..1
..0..1..0..1..0. .0..1..0..1..0. .0..1..1..0..0. .0..1..0..0..0
..0..0..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0
..0..1..1..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..0..0. .0..1..1..1..0. .0..1..0..1..0. .0..0..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0
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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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