已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列{An}的前n项和Sn写的能看懂一点的!是 An=2An-1+2^n-1 ...a1=5 a2=13 a3=33 a4=81!

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