The rule for number sequences used when a number is multiplied by itself is related to the concept of "squaring." When a number is multiplied by itself, it is said to be squared. The general rule for squaring a number is represented as:

Here, n represents the number being squared. For example:
4^2means 4 multiplied by itself, which is equal to 16.
9^2 means 9 multiplied by itself, which is equal to 81.
So, the rule for number sequences involving the multiplication of a number by itself is expressed using the notation
