a1=1 an+1=3an+4^(n+1) 求通项公式

数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. 已知数列｛an｝满足a1=4/3,且an+1=4（n+1）an/3an+n 一道数学题、、数列{an}：a1=4,an=3an-1+2n-1,n≥2求an. 数列a1=-1,an+1=2an+4*{3}^{n-1}a1=-1,an+1=2an+4*{3}^{n-1},求an a(n+1)=2an/3an+4,a1=1/4,求an 数列【an】,a1=5,an+1-an=3+4[n-1],求a50 a1=2,an+1=2/3an+n-4 求an 已知a1=4,an=3an-1+5(n≥),求an an+1 ,n+1是下表 ,an+1=an^3 a1=2 ,求an a1=1,an+1=an/(3+an),求an=?（n为下标） 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 在数列an中,a1=2 an+1=an+3n则an= 数列an,a1=4,an+1=5^n*an,求an用累乘法 已知{an}满足a1=1.an=3*n+2An-1,求an 数列{an}中,a1=2,an+1=4an-3n+1,求证{an-n}是等比数列 4an中n为下标an+1中n+1为下标an-n中an的n为下标 已知数列{An}中,a1=4,an+1+an=6n+3,求证数列an-3n是等比数列,求证数列an的通项an 已知数列{an}中,a1=1,an+1=3an/(an+3)(N∈N*),求通项an, 数列{An}满足a1=1/2,a1+a2+..+an=n方an,求an