Answer
$a_n=n^2$; $n=1,2,3,4,...$
Work Step by Step
Since, we have $1,4,9,16...$
or, $1,2^2,3^2,4^2,........$
Here, $n=1,2,3,4,...$
which can be represented as: $a_n=n^2$; $n=1,2,3,4,...$
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