Find the nth term of the series `=1+4+10+20+35+".."`.

Explanation

To find the nth term of the series \(1 + 4 + 10 + 20 + 35 + \ldots\), we can follow these steps:

### Step 1: Identify the series
The given series is \(1, 4, 10, 20, 35, \ldots\). Let's denote the nth term of the series as \(T_n\).

### Step 2: Write the sum of the series
Let the sum of the first \(n\) terms be denoted as \(S_n\). Thus, we can write:
\[
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