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A180751
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Half the number of n X n binary arrays with each element equal to at least two neighbors
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0
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0, 1, 1, 9, 86, 2986, 205020, 33329847, 11843513563, 9371551715962, 16360949033733903
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OFFSET
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1,4
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COMMENTS
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LINKS
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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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