This blank encounter table is designed for rolling 2D6 which gives you the ability to make those entries closer to 7 a higher chance of being encountered. Thus in a first level dungeon you might want goblins to have a higher chance of being encountered, so you can write the goblin entry in the 7 space.
This table also includes check-boxes next to the entries so that you can mark off an entry once... [click here for more]