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A054652
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Acyclic orientations of the Hamming graph (K_2) x (K_n).
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1
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1, 2, 14, 204, 5016, 185520, 9595440, 659846880, 58130513280, 6376568728320, 851542303852800, 135930981520857600, 25547289000870067200, 5581430113409537587200, 1402137089367777207244800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| This number is equivalent to the number of plans (i.e. structural solutions) of the open shop problem with n jobs and 2 machines - see problems in scheduling theory.
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REFERENCES
| H. Braesel, M. Kleinau, On the number of feasible schedules of the open shop problem - an application of special Latin rectangles, Optimization 23 (1992) 251-260
M. Harborth, Structural analysis of shop scheduling problems, PhD thesis, Otto-von-Guericke-Univ. Magdeburg, GCA-Verlag, 1999 (in German)
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LINKS
| Structural analysis of shop scheduling problems (PhD thesis in German with English abstract)
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FORMULA
| n!*Sum[n!/k!*binomial[n, k], {k, 0, n}]
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MATHEMATICA
| Table[n!*Sum[n!/k!*Binomial[n, k], {k, 0, n}], {n, 0, 20}]
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CROSSREFS
| A002720*n! Cf. A054653, A053870, A054583.
Sequence in context: A090300 A102224 A123543 * A122647 A158097 A136550
Adjacent sequences: A054649 A054650 A054651 * A054653 A054654 A054655
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KEYWORD
| nonn,easy
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AUTHOR
| M. Harborth (Martin.Harborth(AT)vt.siemens.de)
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