a1=1,a(n+1)=2an+n^2+1,求通项

a1=1,a(n+1)=2an+n^2+2n +2 求an 已知a1=2 a(n+1)=2an+2^n+3^n 求an A1=1,A(n+1)/An=(n+2)/n,求An? 数列{an}满足a1=2,a(n+1)=2an+n+2,求an 数列{an},a1=3,an*a(n+1)=(1/2)^n,求an 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an 已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1) 已知a1=3,a(n+1)=(3n-1)/(3n+2)an(n≥1),求an an=a1+(n-1)d 和Sn=n(a1+an)/2中an是什么意思? an=a1+(n-1)d 和Sn=n(a1+an)/2中an是什么 {An}中,A1=1,An=A(n-1)+2n,(n>=2)求{An}通项 an中,a1=2,a(n+1)=3an+3(n+1)次方-2n次方,求an 已知数列an满足a1=2,an=a(n-1)+2n,（n≥2）,求an 数列{an}中,a1=2,a(n+1)=an(n+1)/n,求{an}通项式 已知数列an满足:a1=1,an-a(n-1)=n n大于等于2 求an 在数列{an}中,a1=2,an除以a(n-1)=n除以n+1,求an 已知数列{an}满足a1=33,a(n+1)-an=2n,则an/n的最小值 已知数列{an}满足a1=33,a（n+1）-an=2n,求an/n的最小值