In a sequence of numbers, `a_{3}=0`, `a_{4}=6`, `a_{5}=12`, `a_{6}=18`, `a_{7}=24`. Based on this information, which equation can be used to find the `nth` term in the sequence `a_{n}`?

The sequence given appears to have a common difference of 6 between each term.

Therefore, the equation to find the `nth` term in the sequence `a_{n}` can be written as:
a_n = 6n - 18.