9. 已知数列{an}\{a_{n}\}{an}的前nnn项的积为TnT_{n}Tn,且Tn=n(n=1T_{n}=n(n=1Tn=n(n=1,2,3,⋯ )\dotsb )⋯),则数列{an}(\{a_{n}\}({an}( )))