3. Find the number of bricks

If the algebraic expression $3n^2\left(n+1\right)$ represents the general term for the pattern of a brick arrangement, determine the total number of bricks present in the \(4th\) step of the pattern.

 

 

The value of \(n\) is .

 

The total number of bricks present in the \(4th\) step of the pattern is .