Answer:
-4+3n (if first value corresponds to n=0)
or
-7+3n (if first value corresponds to n=1)
Explanation:
Notice form each term you just need to add 3
For example, the first term is -4, then the second is -4+3=-1
then the third is -4+3+3=2
So you can start from -4 and 3 for each value.
If n=0 is the start value the sequence will be -4+3n
if the first term is n=1 the sequence will be -4+3(n-1)=-7+3n
So depends if your sequence starts from n=1 or n=0 (which is usually just a convention)