已知数列{an}满足a0=1,an=a0+a1+a2+...+a(n-1) (n≥2且n属于N*),则当n属于N*时an
2个回答
an=a0+a1+a2+...+a[n-1]
a[n+1]=a0+a1+...+an
a[n+1]-an=an
a[n+1]/an=2
所以是等比数列
a1=a0=1
所以an=2^[n-1]
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