sequence periodic: 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, 4, 5, 7, 9, 6, ...
linear recurrence: a(n) = a(n-5) for n >= 6
What's the o.g.f.?
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