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A057422
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Axially symmetric (about axis 2) 2n-celled polyominoes with 1 hole.
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0
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0, 2, 4, 12, 24, 57, 112, 244, 483, 998, 1979
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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4,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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