Nope, it's just a random number to 'create' your game with the settings you choose.
For example, go into your Conquests.ini file in your Conquests folder, and scroll down a bit. You will see something like "Seed" or "LatestSeed" and then an "=########". That is your most recently used seed for your latest game (even if you didn't enter one, it gives you one).
There is no chart however..