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钥匙计数之二

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 1609    Accepted Submission(s): 912


Problem Description
一把钥匙有N个槽，2<N<26槽深为1，2，3，4,5,6。每钥匙至少有3个不同的深度且相连的槽其深度之差不得为5。求这样的钥匙的总数。
 

Input
本题无输入
 

Output
对2<N<26，输出满足要求的钥匙的总数。
 

Sample Output
N=3: 104
N=4: 904
N=5: 5880
.
.
.
.
.
N=25: 8310566473196300280
 

Source
ACM暑期集训队练习赛（十）
 

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