Run a loop in bash on ubuntu, expected 1,2,3,...n but got {0..10}

Question

I have a script blah.sh on my ubuntu laptop:

#!/bin/bash

for i in {0..10};
 do echo $i;
done

In the directory with blah.sh I call it with:

sh blah.sh

Which outputs a single line:

{0..10}

Expected ten lines:

1
2
3
4
5
6
7
8
9
10

How can I get my bash script to output as expected?