Find the nth term of the series `1+2+5+12+25+46+"...."`.

Explanation

To find the nth term of the series \(1, 2, 5, 12, 25, 46, \ldots\), we can follow these steps:

### Step 1: Identify the sequence and find the first differences
The given series is:
\[ 1, 2, 5, 12, 25, 46 \]
Now, we calculate the first differences between consecutive terms:
...