数列{an}满足a1=1,a2=2,a(n+2)=[an+a(n+1)]/2,n属于N*.

已知数列｛an｝满足a1=1,a1+a2+a3+.+a(n-1)-an=-1(n≥2且n属于N+). 设数列{An}满足A1+3A2+3^2*A3+...+3^(n-1)*An=n/3,a属于正整数. 设数列{an}满足a1+3 a2+3^2 a3+……+3^n-1 an=n/3,a属于N* 求数列{an}的通项 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 已知数列｛an｝满足a1=1,a2=2,a(n+2)=(an+a(n+1))/2,n属于正整数.求｛an}的通项公式. 数列an中,a1=1,a2=2数列bn满足an+1+（-1）n次an,a属于N* （1）若an等差数列... 设数列{an}满足a1+3a2+3^2a3+.3^n-1×an=n/3,a∈N+. 整数数列{An}满足 A1*A2+A2*A3+…+A(n-1)*An=(n-1)*n*(n+1)/3 ,(n=2,3,… 已知数列{an}满足a1=1,an=a1 +1/2a2 +1/3a3 … +1/(n-1)a(n-1),(n>1,n∈N 已知数列(an)满足a1=1,a2=2,a(n+2)=1/2(an+a(n+1)),n属于自然数 已知数列{an}满足a0=1,an=a0+a1+a2+...+a(n-1) (n≥2且n属于N*),则当n属于N*时an 数列{an}满足a1+2a2+2^2a3+.+2^n-1an=n/2(n属于正整数）,