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A051591
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Number of oriented triangle graphs with transitively oriented maximal cliques, on {n choose 2} points.
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0
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OFFSET
| 2,3
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REFERENCES
| R. H. Jeurissen and Th. Bezembinder, Enumerating oriented triangle graphs, Ars Comb. 42(1996), 151-160.
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FORMULA
| Sum_{d|n} { d^d ( (n-1)! )^d \over n^d d! }, valid for n>4
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EXAMPLE
| n=5: 4!/5 + 5^5 (4!)^5 / (5^5 5!) = 66360
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CROSSREFS
| Sequence in context: A079303 A159445 A146548 * A146203 A192081 A013762
Adjacent sequences: A051588 A051589 A051590 * A051592 A051593 A051594
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KEYWORD
| nonn
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AUTHOR
| R.H.Jeurissen (jeuris(AT)sci.kun.nl)
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