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A209201
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A lower bound on the number of the distinct maximum genus embedding of the complete bipartite graph K(n,n).
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0
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OFFSET
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1,3
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COMMENTS
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Theorem A, p. 3, of Dong.
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LINKS
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FORMULA
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For n odd, a(n) = 2^((n-1)/2)*(n-2)!!^n*(n-1)!^n; otherwise a(n) = 0.
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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