已知数列{an}满足an+1=an+2×三的次方+1,a1=3.求通项公式!

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已知数列{an}满足an+1=an+2×三的次方+1,a1=3.求通项公式!
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已知数列{an}满足an+1=an+2×三的次方+1,a1=3.求通项公式!
已知数列{an}满足an+1=an+2×三的次方+1,a1=3.求通项公式!

已知数列{an}满足an+1=an+2×三的次方+1,a1=3.求通项公式!
请把题写明白一点!