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钥匙计数之一

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 2468    Accepted Submission(s): 1204


Problem Description
一把锁匙有N个槽，槽深为1，2，3，4。每锁匙至少有3个不同的深度且至少有1对相连的槽其深度之差为3。求这样的锁匙的总数。
 

Input
本题无输入
 

Output
对N>=2且N<=31，输出满足要求的锁匙的总数。
 

Sample Output
N=2: 0
N=3: 8
N=4: 64
N=5: 360
..
..
..
..
..
..
..

N=31: ...

注：根据Pku Judge Online 1351 Number of Locks或 Xi'an 2002 改编,在那里N<=16
 

Author
ecjtu_zhousc
 

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