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A054583
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Number of nonisomorphic acyclic orientations of the Hamming graph (K_n) x (K_n).
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2
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OFFSET
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1,2
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COMMENTS
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Also number of plans (i.e., structural solutions) of the open shop problem with n jobs and n machines where the jobs may be interchanged with the machines - see problems in scheduling theory.
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REFERENCES
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Martin Harborth, Structural analysis of shop scheduling problems, PhD thesis, Otto-von-Guericke-Univ. Magdeburg, GCA-Verlag, 1999. (in German)
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LINKS
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CROSSREFS
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KEYWORD
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nonn,nice,hard,more
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AUTHOR
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Martin Harborth (Martin.Harborth(AT)vt.siemens.de)
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STATUS
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approved
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