sequence periodic: 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, 2, 2, 1, 3, 1, ...
linear recurrence: a(n) = a(n-5) for n > 5 with a(1)=1, a(2)=a(3)=2, a(4)=1, a(5)=3
what is the continued fraction expansion ?
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