Answer
The first six terms are:
$\frac{5}{2}, 2, \frac{3}{2}, 1, \frac{1}{2}, 0$
Work Step by Step
The next five terms f the sequence can be found by adding the common difference to obtain:
$a_1=\frac{5}{2}
\\a_2=\frac{5}{2}+(-\frac{1}{2})=\frac{4}{2}=2
\\a_3=.2+(-\frac{1}{2})=\frac{3}{2}
\\a_4=\frac{3}{2}+(-\frac{1}{2})=\frac{2}{2}=1
\\a_5=1+(-\frac{1}{2}) = \frac{1}{2}
\\a_6=\frac{1}{2}+(-\frac{1}{2})=0$