已知a1=2,2an+1=2an+ 1/n(n+1),求an=?

已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 已知A1=1,An=2An-1+n（n>1）,求An. 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. 已知数列｛an｝中a1=6,且an-an-1=(an-1/n)+n+1(n属于N*,n≥2）,求an 已知数列{an}满足a1=1/2,an+1=an+1/n的平方+n求an 已知等比数列{an}中有an+1-an=n×2^n且a1=1求an 已知数列an中,a1=2,an+1=an+lg(n/n+1)求an 已知数列{an}满足a1=33,an+1-an=2n 则求an/n? 已知数列{an}满足a1=33,an+1-an=2n 则求an/n的最小值 已知数列an满足a1=1/2 sn=n平方×an 求an 已知数列{an},满足a1=1/2,Sn=n²×an,求an 已知数列{an}满足a1=33,a（n+1）-an=2n,求an/n的最小值