The first term of a certain sequence is 1, and each subsequent term is obtained by tripling the previous term and adding 2 to the result. Write down a recursive definition of the sequence.

Answer 1

1, 5,17, 53, 161, 485, ...

an= 3(an-1) +2

triple previous term and add three

1st differences triple each term: 4, 12, 36, `08, 324, 972