25
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Find the missing number in this sequence: 0, 1, 4, 9, 16, __

### Response:
25
assistant

The sequence appears to be a well-known sequence called the Fibonacci sequence, where each number is the sum of the two preceding numbers. 

To find the missing number, we need to calculate the difference between consecutive numbers:

- 1 (0+1) = 1
- 4 (1+3) = 4
- 9 (4+5) = 9
- 16 (9+7) = 16

The pattern is clear, the difference between consecutive numbers is increasing by 1, then 2, then 3, and so on.

The next difference should be 5 (following the pattern). So, the missing number in the sequence is:
- 16 (16+11) = 27

The complete sequence would be: 0, 1, 4, 9, 16, 27.