A:pla
B:planning
C:planned
D:to pla
已知{an}中,a1=1,其前n项和为Sn,且满足an=2Sn22Sn-1.
(Ⅰ)求证:数列{1Sn}是等差数列;
(Ⅱ)证明:S1+12S2+13S3+…+1nSn<32.