1747: Tri Tiling
内存限制：128 MB
时间限制：1 S
题面：传统
评测方式：文本比较
上传者：
提交：2
通过：2
题目描述
In how many ways can you tile a 3xn rectangle with 2x1 dominoes?
Here is a sample tiling of a 3x12 rectangle.
Input consists of several test cases followed by a line containing -1. Each test case is a line containing an integer 0 ≤ n ≤ 30. For each test case, output one integer number giving the number of possible tilings.
输入样例 复制
2
8
12
-1
输出样例 复制
3
153
2131