Question: In a string, distance between two symbols is the number of symbols between them plus one. For example, in a string xyyx, y is at

In a string, distance between two symbols is the number of symbols between them plus one. For example, in a string xyyx, y is at distance 1 from another y, and x is at distance 3 from another x. Find the number of strings of length n using at most k distinct symbols, such that the minimal distance between any two identical symbols is k.

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