设数列{an}满足：a1=1，a2=4，a3=9，an=an-1+an-2-an-3 （n=4,5, ……）,则a201

设数列{an}满足：a1=1，a2=4，a3=9，an=an-1+an-2-an-3 （n=4,5, ……）,则a2015 =

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设数列{an}满足：a1=1，a2=4，a3=9，an=an-1+an-2-an-3 （n=4,5, ……）,则a201

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