So, Louis XVI is executed, slightly before and after this there're some revolutionary governments, followed by Napoleon. After Napoleon's defeat, the Bourbon Restoration occurs, leading to the kingship of Louis XVIII.

Why isn't there a Louis XVII? I'm going to go out on a limb and assume that French monarchs are not like elevators, they don't miss out unlucky numbers. What's going on?

(Please correct any of the above if I've misunderstood, I'm always happy to learn.)