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It is a version of the Fibonacci sequence, where each term is the sum of the previous two terms.
The sequence is defined by the recursive formula:
t(n) = t(n-1) + t(n-2) where t(n) is the nth term
Here, t(1) = 2 and t(2) = 3 though for the more general form of the Fibonacci sequence, t(1) = 1 and t(2) = 1.
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