已知数列an满足a1=1,a(n+1)=an/{3(an)+1} Sn=a1a2+a2a3+.+an(an+1),求Sn已知数列an满足a1=1,a(n+1)=an/{3(an)+1}Sn=a1a2+a2a3+......+an(an+1),求Sn

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