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Tri Tiling

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 6675    Accepted Submission(s): 3845

Problem 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
2 8 12 -1

Sample Output
3 153 2131


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