<s>[INST] In this problem, the first two natural numbers are 1, 2. The third number is the sum of the first two numbers, i.e, 1 + 2 = 3. In the same way, the fourth number is the sum of the first three numbers, i.e. 1 + 2 + 3 = 6. Find the 10th number in this sequence.

## Step 1: Define the sequence correctly
The sequence starts with 1, 2, and each subsequent number is the sum of all the previous numbers. So, the sequence is 1, 2, 3 (which is 1 + 2), 6 (which is 1 + 2 + 3), and so on.

## Step 2: Calculate the first few terms to identify a pattern
Let's list the sequence with its sums to identify any pattern or formula that can help calculate the 10th term efficiently.
- First term: 1
- Second term: 2
- Third term: 1 + 2 = 3
- Fourth term: 1 + 2 + 3 = 6
- Fifth term: 1 + 2 + 3 + 6 = 12
- Sixth term: 1 + 2 + 3 + 6 + 12 = 24
- Seventh term: 1 + 2 + 3 + 6 + 12 + 24 = 48
- Eighth term: 1 + 2 + 3 + 6 + 12 + 24 + 48 = 96
- Ninth term: 1 + 2 + 3 + 6 + 12 + 24 + 48 + 96 = 192
- Tenth term: 1 + 2 + 3 + 6 + 12 + 24 + 48 + 96 + 192 =?[/INST]