已知a1=2,an=an-1+n,求an.急用!

已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 已知{an}满足a1=1.an=3*n+2An-1,求an 已知A1=1,An=2An-1+n（n>1）,求An. 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an 已知数列an中,a1=1,an/an-1=n+1/n,n大于等于2,求an 几个数列问题.已知数列{an} a1=1,an+1=an/(1+n^2*an) 求an 已知数列{an} 满足a1=1 a1*a2*a3.*an=n^2 求an 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 已知{an}满足a1=1,a(n+1)=2an+2,求an 已知数列{an},A1=1 A(n+1)=2an/an+2 求a5 已知数列an,a1=1,n+1=2an/an+1,求a5rt 已知a1=1,an+1=an+2的n次方,求an. 已知an+1=2的n次方an,a1=2,求an通项 已知数列{an}中,a1=1,a1a2a3……an=n^2,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=1/2 sn=n平方×an 求an 已知数列An满足 A1=1/2 Sn=N²An 求An 已知a1=2,an=an-1+n,求an.急用! 已知a1=2,an=an-1+n,求an.