数列{an}满足(a1/1)+(a2/3)+(a3/5)+…+[an/(2n-1)]=3^(n+1),则数列{an}的通项公式为?

数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 设数列AN满足A1等于1,3(A1+a2+~+AN)=(n+2)an,求通向公式 已知数列{an}满足a1=1,a2=3,an+2=3an+1-2an求an 若数列｛an｝满足a1,a2-a1,a3-a2,...是以1为首相,3为公比的等比数列,则an______ 已知数列an满足a1=1,a2=3,an+1.an-1=an,求a2013 数列{an}满足a1=3,a2=6,an+2=an+1-an,求a2013 数列{an}满足a1=3,a2=6,an+2=an+1-an,求a2008 已知数列{an}满足a1,a2-a1,a3-a2,...,an-an-1,...是首项为1,公比为1/3的等比数列.求an的表达式? 数列{an}满足:a1,a2-a1,a3-a2……,an-an-1构成以2为首项,3为公比的等比数列,求an 数列an满足a1=1,a2=1/3,并且an(an-1+an+1)=2an+1an-1.则数列第2012项为? 数列an满足,a1=1/4,a2=3/4,an+1=2an-an-1(n≥2,n属于N*),数列bn满足b1 数列{an}满足a1,a2-a1,a3-a2,……,an-an-1是以1为首项,1/3为公比的等比数列,则通项公式 (1)数列{an}中,a1=1,a2=-3,a(n+1)=an+a(n+2),则a2005=____(2)已知数列｛an｝满足a1=1,a1×a2×a3…an=n^2,求an. 已知数列an满足an=1+2+...+n,且1/a1+1/a2+...+1/an 设数列{an}满足lg(1+a1+a2+...+an)=n+1,求通项公式an 已知,数列{an}满足a1=1,an+1=3an +1,证明:1/a1+1/a2+…+1/an 已知数列{an}满足a1=1,an=a1+2a2+3a3.+(n-1)an-1 (n>=2),则{an}的通项是什么 已知数列{an}满足a1=1,an=a1+2a2+3a3+……+(n-1)an-1 (n≥2)求an=?