The general term formula of + 1, - 8 / 5, + 15 / 7, - 24 / 9 Finding the general term formula of sequence 1,2,2,4,3,8,4,16,5 and +The general formula of 1, - 8 / 5, + 15 / 7, - 24 / 9 By the way, give me some ideas,

The general term formula of + 1, - 8 / 5, + 15 / 7, - 24 / 9 Finding the general term formula of sequence 1,2,2,4,3,8,4,16,5 and +The general formula of 1, - 8 / 5, + 15 / 7, - 24 / 9 By the way, give me some ideas,

When n is odd, an = (n + 1) / 2; when n is even, an = 2 ^ (n / 2) [that is, 2 ^ 1,2 ^ 2,2 ^ 3...] second question: 1 - 8 / 5 15 / 7 24 / 9 change 3 / 3 - 8 / 5 15 / 7 24 / 9, the denominator is 3 8 15 24 3 = 3 without considering sign