Question

Let an, for n≥1, be the number of strings of length n over {0,1,2,3}, allowing repetitions,...

Let an, for n≥1, be the number of strings of length n over {0,1,2,3}, allowing repetitions, suchthat no string contains a 3 to the right of a 0. Find a recurrence relation and initial condition(s) for an.

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