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A318188
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Number of nonisomorphic 2-connected circle graphs of order n.
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0
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OFFSET
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1,4
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LINKS
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EXAMPLE
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The 3 circle graphs with n = 4 vertices which are 2-connected are K_4, the square and the square with one diagonal.
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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