a1=3 a(n+1)=3an^2

数列{an},a1=1,a(n+1)=2an-n^2+3n 数列{an},a1=1/2,a(n+1)=3an/(an)+3, a(n+1)=2an/3an+4,a1=1/4,求an 数列A(n+1)=2An+2n-3,A1=2,求An 已知数列{an}满足,a1=2,a(n+1)=3根号an,求通项an 19.一直数列An,A1=m,A(n+1)=2An+3^(n+1). 已知数列{an}满足a1=1;an=a1+2a2+3a3+...+(n-1)a(n-1); 已知数列{an}满足a1=1,2a（n+1)an+3a(n+1)+an+2=0. 数列{An}中,a1=2,a (n+1)=4an-3n+1,n为N* 已知数列{an}满足a1=1,an=a1 +1/2a2 +1/3a3 … +1/(n-1)a(n-1),(n>1,n∈N 数列竞赛题!在线等!数列{an},a1=2/3,a(n+1)=an^2+a(n-1)^2+.+a1^2(n∈N+),若对 已知在数列{an}中,a1=2,a(n+1)-3a(n)=3n,求an