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Count Total Number of Colored Cells

There exists an infinitely large two-dimensional grid of uncolored unit cells.

There exists an infinitely large two-dimensional grid of uncolored unit cells. You are given a positive integer n, indicating that you must do the following routine for n minutes:

Below is a pictorial representation of the state of the grid after minutes 1, 2, and 3.

Return the number of colored cells at the end of n minutes.

Example 1

Input: n = 1

Output: 1

Explanation: After 1 minute, there is only 1 blue cell, so we return 1.

Example 2

Input: n = 2

Output: 5

Explanation: After 2 minutes, there are 4 colored cells on the boundary and 1 in the center, so we return 5.

Constraints

1 <= n <= 10^5

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class Solution {
    public long coloredCells(int n) {
        
    }
}

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