Answer:
The first five terms of the given sequence is 1, 0, -3, -8, -15
Step-by-step explanation:
Given: nth term of sequence 
We have to find the first five terms of the given sequence,
Consider the given nth term of sequence 
Substitute n = 1 ,
we get, 
Substitute n = 2 ,
we get, 
Substitute n = 3,
we get, 
Substitute n = 4 ,
we get 
Substitute n = 5 ,
we get 
Thus, first five terms of the given sequence is 1, 0, -3, -8, -15