To clarify:

Let's take a 15/16 bracket...

First round: 1-15, 2-14, 3-13, 4-12, 5-11, 6-10, 7-9, 8 gets a bye

11/16 bracket: 1-11, 2-10, 3-9, 4 5 6 7 8 get byes

Hope this helps.