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Jul 11, 2021 at 7:01 comment added Wlod AA Let $\ n>2\ $ be a prime number. Let the vertices form a regular n-gon. There are $\ a:=\frac{n-1}2\ $ Hamiltonian cycles, one for each length of the edges. Then there are $\ \binom a2\ $ (unordered) pairs of these cycles where the members of the same pair are edge-disjoint.
Jul 11, 2021 at 5:43 comment added bof Related to A002816, isn't it? Number of Hamiltonian cycles in the complement of the cycle graph $C_n$?
Jul 11, 2021 at 5:26 comment added Sam Hopkins It should be relatively straightforward to write an inclusion-exclusion expression for this number.
Jul 11, 2021 at 5:12 history asked Manfred Weis CC BY-SA 4.0