数列an中,a1=1,an=2Sn^2/2sn-1(n大等于2.n属于N*)则sn=?

数列an中,a1=1,sn+1=sn-1/2an,则an=? 数列{an}中,已知a1=1,an=2Sn^2/(2Sn-1).求an通项公式 已知数列an中 a1=-2且an+1=sn（n+1为下标）,求an,sn 已知数列an中,a1=-2,an+1=Sn(n∈N+),求an和Sn的表达式 在数列{an}中,a1=2,an=2an-1+2^n+1 求an和Sn 已知数列{an}中a1=1,且满足an+an-1不等于0,Sn=1/6*(an+1)(an+2).(1)求通项an,并说明{an}是什么数列(2)求数列{an}的前n项和Sn 数列｛an｝,中,a1=1/3,设Sn为数列｛an｝的前n项和,Sn=n（2n-1）an 求Sn 已知AN中,a1=2,6Sn=（an+1)(an+2),求数列An的通项公式An和Sn 数列{an}中,sn表示前n项和.若a1=1,sn+1=4an+2 已知数列{an}满足:a1=3,an=Sn-1+2n,求数列an及sn 数列{an}中,a1=1,当n>1时,2Sn^2=2anSn-an,求通项an 数列{an}中,a1=1,当n>1时2Sn²=2anSn-an,求通项an 数列{an}中前n项和为sn且a1=2,snsn-1=an,求an 数列an中,a1=3,an+1=3an,则an= ,sn= 已知数列{an}满足a1=1/2,sn=n^2an,求通项an 已知数列an首项a1不等于0,Sn+1=2Sn+a1,求极限（an/sn） 数列an满足a1=1/3,Sn=n(2n-1)an,求an 已知数列{an},满足a1=1/2,Sn=n²×an,求an