I just added a user to an almost brand new drupal 7 install. I noticed the user ID was 13. Call me superstitious, but I deleted that user. Then I created another user.
The new user had entity ID 15. I was expecting 14 (one greater than the previous entity).
So now I'm curious. What is/was entity 14? Is there any way to find it? Is there any way to know in advance what the next entity ID will be?