数列an满足a1=2,a2=5,a(n+2)=3a(n+1)-2an

数列an满足a1=2,a2=5,a(n+2)=3a(n+1)-2an 已知数列{an}满足a1=1;an=a1+2a2+3a3+...+(n-1)a(n-1); 设数列{an}满足a1+3a2+3^2a3+.3^n-1×an=n/3,a∈N+. 已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1 已知数列{an}满足a1=1,a2=3,a(n+2)=3a(n+1)-2an 整数数列{An}满足 A1*A2+A2*A3+…+A(n-1)*An=(n-1)*n*(n+1)/3 ,(n=2,3,… 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 设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数. 已知数列{an}满足条件:a1=5,an=a1+a2+...a(n-1) n大于等于2,求数列{an}的通项公式 设数列{an}满足a1+3 a2+3^2 a3+……+3^n-1 an=n/3,a属于N* 求数列{an}的通项 已知数列An满足A1=1,An=3^(n-1)+A(n-1)(n=>2).(1)求A2,A3;(2)证明An（3^n-1 数列{an}满足：1/a1+2/a2+3/a3+…+n/an=2n