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这题递推式是什么

Posted by z12y12l12 at 2007-10-06 15:19:40 on Problem 3420 
我推的F(n) = F(n-1) + 4F(n-2) + 2F(n-3) + 3F(n-4)
但是和sample不符..有F(n-5)么?
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