(5) Sequence Defined by a Recursive Formula A recursive formula is a formula that defines each term of a sequence using preceding term (s). Recursive formulas must always state the initial term, or terms, of the sequence. Notation for recursive sequence using the previous term: an = f(an -1) or an + 1 = f(an) Example 5: Find the first 5 terms of each sequence 1 a) an= - 7an- 1, a1 = 2 b) bn= bn-1+ 4, b1 =2 "c) Fn= Fn-1+Fn-2, F1 = 1, F2= 1