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Sep 13 at 15:52 vote accept Roland Bacher
Sep 4 at 23:57 answer added Abdelmalek Abdesselam timeline score: 2
Sep 4 at 16:30 comment added Will Sawin The derivative at $x=1$ over $N!$ will be $N$ times the average distance between two randomly selected vertices of the graph, since each vertex is sent to a randomly selected vertex. This explains your $(N^2-1)/3$ formula.
Sep 4 at 14:14 history edited Roland Bacher CC BY-SA 4.0
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Sep 4 at 13:59 history asked Roland Bacher CC BY-SA 4.0