A:CH3CH(CH2)13CH3
B:CH3(CH)14CH2CH3 CH3 CH3
C:CH3(CH2)14CHCH3
D:C18H38
(I)求数列{an}的通项公式;
(Ⅱ)令bn=(2n﹣1)an,求数列{bn}的前n项和Tn.