11351: Tri Tiling

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:0

Description

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.

Sample Input Copy

2
8
12
-1

Sample Output Copy

3
153
2131