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A089454
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Number of n-celled polyominoes with exactly 2 holes.
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4
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 41, 346, 2384, 14560, 81863, 433172, 2192752, 10726252, 51094203, 238259280, 1092053068, 4934652298, 22034767837, 97407519119, 426916828181
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OFFSET
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1,11
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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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