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A089456
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Number of n-celled polyominoes with exactly 4 holes.
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4
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 179, 2509, 25609, 214932, 1578984, 10536260, 65411645, 383981499, 2156114468
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OFFSET
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1,17
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LINKS
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CROSSREFS
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KEYWORD
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hard,nonn
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AUTHOR
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STATUS
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approved
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