Calculate the first eight terms of the sequence [[$ a_1 = 1 $]], [[$ a_2 = 1 $]], [[$ a_n = a {n - 1} + a {n - 2} $]], when [[$ n ≤ 3 $]]. What number sequence is this?



Answer: The first eight terms of the sequence are , , , , , , , .

The sequence is the sequence.