The minimum number of base cases required to specify this sequence with a recursive definition is 2.
In mathematics and computer science, a recursive definition, or inductive definition, is used to describe the elements in a set in terms of other elements in the set. Some examples of recursively-definable objects consist of factorials, natural numbers, Fibonacci numbers, and the Cantor ternary set. Recursion can be described as a technique used to solve computer problems by building a function that calls itself until your program achieves the desired result.
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