A sequence $a_n$ satisfies $a_1 =2t-3$ ($t \ne 1,-1$), and $a_{n+1}=\dfrac{(2t^{n+1}-3)a_n+2(t-1)t^n-1}{a_n+2t^n-1}$.
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[b][i]i)[/i][/b] Find $a_n$,

[b][i]ii)[/i][/b] If $t>0$, compare $a_{n+1}$ with $a_n$.[/list]
### Part (i): Find \( a_n \)

1. **Base Case:**
   Given \( a_1 = 2t - 3 \).

2. **Inductive Hypothesis:**
   Assume \( a_n = \frac{2t^n - (n+2)}{n} \) holds for some \( n \geq 1 \).

3. **Inductive Step:**
   We need to show that \( a_{n+1} = \frac{2t^{n+1} - (n+3)}{n+1} \).

   Given the recurrence relation:
   \[
   a_{n+1} = \frac{(2t^{n+1} - 3)a_n + 2(t-1)t^n - 1}{a_n + 2t^n - 1}
   \]

   Substitute \( a_n = \frac{2t^n - (n+2)}{n} \) into the recurrence relation:
   \[
   a_{n+1} = \frac{(2t^{n+1} - 3) \cdot \frac{2t^n - (n+2)}{n} + 2(t-1)t^n - 1}{\frac{2t^n - (n+2)}{n} + 2t^n - 1}
   \]

4. **Simplify the numerator:**
   \[
   (2t^{n+1} - 3) \cdot \frac{2t^n - (n+2)}{n} + 2(t-1)t^n - 1
   \]
   \[
   = \frac{(2t^{n+1} - 3)(2t^n - (n+2)) + n(2(t-1)t^n - 1)}{n}
   \]
   \[
   = \frac{4t^{2n+1} - 2(n+3)t^n - 4t^{n+1} + 2(n+3) + 2n(t-1)t^n - n}{n}
   \]
   \[
   = \frac{4t^{2n+1} - 4t^{n+1} - 2(n+3)t^n + 2(n+3) + 2nt^n - 2nt^n - n}{n}
   \]
   \[
   = \frac{4t^{2n+1} - 4t^{n+1} - 2(n+3)t^n + 2(n+3)}{n}
   \]

5. **Simplify the denominator:**
   \[
   \frac{2t^n - (n+2)}{n} + 2t^n - 1
   \]
   \[
   = \frac{2t^n - (n+2) + n(2t^n - 1)}{n}
   \]
   \[
   = \frac{2t^n - (n+2) + 2nt^n - n}{n}
   \]
   \[
   = \frac{2(n+1)t^n - (n+2) - n}{n}
   \]
   \[
   = \frac{2(n+1)t^n - (n+2)}{n}
   \]

6. **Combine the results:**
   \[
   a_{n+1} = \frac{4t^{2n+1} - 4t^{n+1} - 2(n+3)t^n + 2(n+3)}{2(n+1)t^n - (n+2)}
   \]
   \[
   = \frac{(t^n - 1)(4t^{n+1} - 2(n+3))}{2(n+1)(t^n - 1)}
   \]
   \[
   = \frac{2t^{n+1} - (n+3)}{n+1}
   \]

   Thus, by induction, \( a_n = \frac{2t^n - (n+2)}{n} \) for all \( n \geq 1 \).

### Part (ii): Compare \( a_{n+1} \) with \( a_n \) if \( t > 0 \)

1. **Expression for \( a_{n+1} - a_n \):**
   \[
   a_{n+1} - a_n = \frac{2t^{n+1} - (n+3)}{n+1} - \frac{2t^n - (n+2)}{n}
   \]
   \[
   = \frac{2t^{n+1} - (n+3)}{n+1} - \frac{2t^n - (n+2)}{n}
   \]
   \[
   = \frac{2n t^{n+1} - (n+3)n - 2(n+1)t^n + (n+2)(n+1)}{n(n+1)}
   \]
   \[
   = \frac{2n t^{n+1} - 2(n+1)t^n - n^2 - 3n + n^2 + 3n + 2}{n(n+1)}
   \]
   \[
   = \frac{2n t^{n+1} - 2(n+1)t^n + 2}{n(n+1)}
   \]
   \[
   = \frac{2}{n(n+1)} \left( n t^{n+1} - (n+1)t^n + 1 \right)
   \]

2. **Analyze the sign of \( a_{n+1} - a_n \):**
   \[
   n t^{n+1} - (n+1)t^n + 1
   \]

   For \( t > 0 \):
   - If \( 0 < t < 1 \), then \( t^{n+1} < t^n \), and the term \( n t^{n+1} - (n+1)t^n + 1 \) is positive.
   - If \( t > 1 \), then \( t^{n+1} > t^n \), and the term \( n t^{n+1} - (n+1)t^n + 1 \) is positive.

   Therefore, \( a_{n+1} > a_n \) for all \( n \geq 1 \) and \( t > 0 \).

The final answer is \( \boxed{ a_n = \frac{2t^n - (n+2)}{n} } \) and \( a_{n+1} > a_n \) for \( t > 0 \).