设数列【an】满足a1=1,3（a1+a2+a3+······+an）=（n+2）an,求通项an

设数列【an】满足a1=1,3（a1+a2+a3+······+an）=（n+2）an,求通项an 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 设数列｛an}满足a1+3a2+3^2a3+······+3^(n-1)an=n/3,a∈N*.（1）求数列{an}的通 数列{an}中,a1+a2+a3···+an=2n+1(n∈N※),求an 若数列{an}满足a1+3a2+3²a3+···+3^n-1an=n/2 则an= 已知：数列{an }满足a1+2a2+2^2·a3+``````+2^n-1·an=n/2(n属于正整数） 数列 an种,a1·a2·a3.·an=n²,求通项公式 数列an满足a1+2a2+3a3+...+nan=(n+1)(n+2) 求通项an 设数列｛an｝满足a1=2,an+1-an=3·2^(2n-1) 设数列{An}满足A1+3A2+3²A3+******+3^（n-1）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+3a2+3²a3+...+3^(n-1)an=n/3,n∈N+*.（1）求数列{an}