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sequences are a type of function, they are usually distinguished notationally from functions in that the input is written as a subscript rather than in parentheses, that is, rather than . There are terminological differences as well: the value of a sequence at the lowest input (often ) is called the "first element" of the sequence, the value at the second smallest input (often ) is called the "second element", etc. Also, while a function abstracted from its input is usually denoted by a single letter (such as ), a sequence abstracted from its

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