若数列{an}满足a1+3a2+3²a3+···+3^n-1an=n/2 则an=

若数列{an}满足a1+3a2+3²a3+···+3^n-1an=n/2 则an= 若数列{an}满足a1+2a2+3a3+~~+nan=n(n+1)(2n+1),则an= 设数列【an】满足a1=1,3（a1+a2+a3+······+an）=（n+2）an,求通项an 数列{an}满足：1/a1+2/a2+3/a3+…+n/an=2n 数列an满足a1+2a2+3a3+...+nan=(n+1)(n+2) 求通项an 设数列{An}满足A1+3A2+3²A3+******+3^（n-1）An=n/3 设数列an满足a1+3a2+3²a3……+3n-1次方an=n/3 设数列｛an｝满足a1+2a2+3a3+.+nan=n(n+1)(n+2) 设数列an满足a1=a2=1,a3=2,且对正整数n都有an·an+1·an+2·an+3=an+an+1+an+2+a 已知数列{an}满足a1+2a2+3a3+…+nan=n(n+1)(n+2),则a1+a2+a3+…+an=多少? 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)a(n-1);