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The domain of a sequence is typically set to the natural numbers because sequences are defined as ordered lists of elements, where each element is associated with a unique position in the list. Natural numbers (1, 2, 3, ...) provide a straightforward way to index these positions, ensuring that each term in the sequence can be easily referenced. Additionally, starting from 1 (or sometimes 0 in certain contexts) allows for a clear and unambiguous definition of the first term, maintaining the sequential nature of the list. This indexing helps in mathematical analysis and applications of sequences.

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