Just insert #8^(th)# term into the equation and a value will be produced.

Explanation:

The value of #8^(th)# term in this case will be 32, as #1/2##(8)^2# is equal to 32. However, it only works if the sequence doesn't rely upon the previous, #a_n#, term to find the next term, #a_(n+1)#, such as recurrence relation.