1411. Number of Ways to Paint N × 3 Grid
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https://leetcode.com/problems/number-of-ways-to-paint-n-3-grid
You have a grid of size n x 3 and you want to paint each cell of the grid with exactly one of the three colors: Red, Yellow, or Green while making sure that no two adjacent cells have the same color (i.e., no two cells that share vertical or horizontal sides have the same color).
Given n the number of rows of the grid, return the number of ways you can paint this grid. As the answer may grow large, the answer must be computed modulo 109 + 7.
Example 1:
Example 2:
Example 3:
Example 4:
Example 5:
Constraints:
n == grid.length
grid[i].length == 3
1 <= n <= 5000
