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A180754
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Half the number of nX5 binary arrays with each element equal to at least two neighbors
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1
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0, 3, 3, 21, 86, 410, 1874, 8840, 41755, 197883, 936625, 4434387, 20996674, 99434998, 470911050, 2230166446, 10561720749, 50018822099, 236882697591, 1121846953883, 5312927519916, 25161362888858, 119161085234850, 564332106834338
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 9*a(n-1) - 26*a(n-2) + 24*a(n-3) + 47*a(n-4) - 157*a(n-5) - 43*a(n-6) + 641*a(n-7) - 643*a(n-8) - 952*a(n-9) + 3460*a(n-10) - 2021*a(n-11) - 2111*a(n-12) + 2715*a(n-13) - 1249*a(n-14) - 4657*a(n-15) - 1514*a(n-16) + 1961*a(n-17) - 1230*a(n-18) + 6713*a(n-19) + 8832*a(n-20) + 10212*a(n-21) + 1971*a(n-22) - 6552*a(n-23) - 2819*a(n-24) - 2898*a(n-25) - 973*a(n-26) + 302*a(n-27) + 433*a(n-28) + 286*a(n-29)
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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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