Tri Tiling
Description:
In how many ways can you tile a 3xn rectangle with 2x1 dominoes?
Here is a sample tiling of a 3x12 rectangle.
Input:
Input consists of several test cases followed by a line containing -1. Each test case is a line containing an integer 0 <= n <= 30.
Output:
For each test case, output one integer number giving the number of possible tilings.
Sample Input:
2 8 12 -1
Sample Output:
3 153 2131
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