14.已知数列满足a1+3a2+3^2a3+.+3^(n-1)a(n),则通项公式a(n)=

14.已知数列满足a1+3a2+3^2a3+.+3^(n-1)a(n),则通项公式a(n)= 已知数列{an}满足a1=1;an=a1+2a2+3a3+...+(n-1)a(n-1)（n≥2);求通项公式 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,an=a1 +1/2a2 +1/3a3 … +1/(n-1)a(n-1),(n>1,n∈N 设数列{an}满足a1+3a2+3^2a3+.3^n-1×an=n/3,a∈N+. 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 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+2a2+3a3+...+nan=(2n-1)*3^n(n属于正整数)求数列{an}得通项公式 设数列｛an｝满足a1+2a2+3a3+.+nan=n(n+1)(n+2) 已知数列an满足a1=1,an=a1+2a2+3a3+4a4+.(n-1)a(n-1),求通项an 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a1+2a2+3a3+...+nan=n(n+1)(n+2)求an