Find the First Six Terms of the Sequence $$a _ { 1 } = 9 , a _ { n } = a _ { n - 1 } + 6$$

Find the first six terms of the sequence.
- $$a _ { 1 } = 9 , a _ { n } = a _ { n - 1 } + 6$$

A) 15, 21, 27, 33, 39, 45
B) 9, 6, 12, 18, 24, 30
C) 0, 6, 12, 18, 24, 30
D) 9, 15, 21, 27, 33, 39