On the general term formula of swing sequence Sequence 1 2 1 2 1 2 1 2 It is easy to see the general term formula of that Sequence 1 2 3 1 2 3 1 2 3 What about the general term formula? also Sequence 1 2 3 4 1 2 3 4 1 2 3 4 What about the general term formula? Please show me the way!

On the general term formula of swing sequence Sequence 1 2 1 2 1 2 1 2 It is easy to see the general term formula of that Sequence 1 2 3 1 2 3 1 2 3 What about the general term formula? also Sequence 1 2 3 4 1 2 3 4 1 2 3 4 What about the general term formula? Please show me the way!

Direction: Method 1 uses the characteristics of exponential function, method 2 uses the cyclic characteristics of trigonometric function, sequence 1 2 1 2 1 2 The general term formula an = 1.5 + 0.5 * (- 1) ^ n (- 1) ^ n represents the n-th power sequence of - 1 1 1 23 1 23 1 23 The general formula sequence of 1 23 4 1 23 4 1 23 4 1 23 4 Of