Well 512 / 32 = 16...and I didn't know that it counted from 0, so I'll try 15. Thanks Dr. Spoon
Alright...I've got it set to 15...the first row in the left half side of the first 8 tiles (which is normal width for tile sheets) gets chosen normally, then I pick the first one in the second row and it places down the tile that's in the third row and to the right two. If I pick a tile in the top row and all the way to the right it places down the tile that's in the third row and to the right twice (like if I pick the first tile in the second row).
Here's some testing I've done:
( Layout of the tiles goes from 1 - 16 in the first row, 17 - 32 in the second row, and so on)
1 - 1
2 - 2
3 - 3
4 - 4
5 - 5
6 - 6
7 - 7
8 - 17
9 - 18
10 - 19
11 - 20
...
So it just ignores the right side when you hit the 8th tile (or when you hit the right half) and goes into the second row of the left side...