a1=20,an+1=an+2n-1.求an的通项公式都来看一下,挺不错的一道题

已知{an}满足a1=1.an=3*n+2An-1,求an 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. 数列{an}中,a1=1,an+1/an=n/n+2,求an a1=1,Sn=n^2an,求an 1.a1=1 an=a1+2a2+.(n-1)an-1求an2.an+a（n+1）=1/2,a1=1,求an a1=1/2,an+1=an/an+2,求n/an的sn 数列an集合中,a1=2,an+1=an+(2n+1),求an. an+1 ,n+1是下表 ,an+1=an^3 a1=2 ,求an 数列{an}中,a1=35,an+1-an=2n-1,求an 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 已知数列{an}满足an+1=2an+3.5^n,a1=6.求an 1.a1=1,an+1=an+2n-1,求an 2.a1=1,an+1=2an+2n-1,求an 3.a1=1,an+1=3an+3n,求an4.a1=1,an+1=3an+6,求an就这4个,用累加或累乘的方法做 已知数列（an）满足a1=1.an+1=3an+2n-1,求an 1、在数列{an}中,a1=1.a(n+1)=3an+2n+1.求an.2、在数列{an}中,a1=-1,a(n+1)=(3an-4)/[(an)-1].求an. 已知A1=1,An=2An-1+n（n>1）,求An. 数列{an}满足a1=2,a(n+1)=2an+n+2,求an 数列an满足a1=1/3,Sn=n(2n-1)an,求an