I'm confused by the output I see for n=3. For n=3, by my count there are 721 numbers from 0<=x<=1000 which have unique digits. So why is the answer reported to be 739 ?

To confirm my result, I've created an excel sheet which confirms that there are only 721 numbers between 0 and 1000 which have unique digits. Here's the link to the spreadsheet:

https://docs.google.com/spreadsheets/d/1rqMg6Ubt9WJ6mBa2SAmLzwpvmOnt9xUJ_tp-cvMMdns/edit?usp=sharing

Can someone explain to me what's the problem ?