The code should be as follows (note the shebang says bash, not sh):
#!/bin/bash
echo "Bash version ${BASH_VERSION}..."
for i in {1..10}
do
echo "Welcome $i times"
done
You can use {0..10..1} if you want to start from 0.
Source: http://www.cyberciti.biz/faq/bash-for-loop/.