0790. Domino and Tromino Tiling
https://leetcode.com/problems/domino-and-tromino-tiling
Description
You have two types of tiles: a 2 x 1
domino shape and a tromino shape. You may rotate these shapes.
Given an integer n, return the number of ways to tile an
2 x n
board. Since the answer may be very large, return it modulo 109 + 7
.
In a tiling, every square must be covered by a tile. Two tilings are different if and only if there are two 4-directionally adjacent cells on the board such that exactly one of the tilings has both squares occupied by a tile.
Example 1:

**Input:** n = 3
**Output:** 5
**Explanation:** The five different ways are show above.
Example 2:
**Input:** n = 1
**Output:** 1
Constraints:
1 <= n <= 1000
ac
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