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A267388
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Number of acyclic orientations of the Turán graph T(n,8).
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2
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1, 1, 2, 6, 24, 120, 720, 5040, 40320, 322560, 2943360, 30078720, 339696000, 4196666880, 56255149440, 812752093440, 12585067447680, 194465276369280, 3220308737573760, 56845456896816000, 1064856592650695040, 21087473349235547520, 440007278378842984320
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OFFSET
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0,3
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COMMENTS
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An acyclic orientation is an assignment of a direction to each edge such that no cycle in the graph is consistently oriented. Stanley showed that the number of acyclic orientations of a graph G is equal to the absolute value of the chromatic polynomial X_G(q) evaluated at q=-1.
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LINKS
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FORMULA
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a(n) ~ n! / (7 * (1 - log(8/7))^(7/2) * 8^n * (log(8/7))^(n+1)). - Vaclav Kotesovec, Feb 18 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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