Jacobsthal numbers in generalised Petersen graphs

We prove that the number of $1$-factorisations of a generalised Petersen graph of the type $GP(3k,k)$ is equal to the $k$th Jacobsthal number $J(k)$ if $k$ is odd, and equal to $4J(k)$, when $k$ is even. Moreover, we verify the list colouring conjecture for $GP(3k,k)$.

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