Write the First Five Terms of the Sequence Whose General $a _ { n } = n ^ { 2 } - n$

Write the first five terms of the sequence whose general term is given.
- $a _ { n } = n ^ { 2 } - n$

A) $0,2,6,12,20$
B) $1,4,9,16,25$
C) $2,6,12,20,30$
D) $0,3,8,15,24$