Correct me if I'm wrong, but as far as I can tell the table listing the various chances of success with increasing number of dice is incorrect.
For instance, when you roll 3d6 the chance of at least one success is clearly 50% (3 * 1/6) not 42%, and so on.
It seems the table is listing the chances of only getting one success and discards the cases where more than one dice is a success.
At least to me this is quite misleading.
Also the "Pushed Roll" column seems equally wrong. Pushing 1 dice should yield 33.34% chance (2 * 1/6) and not 29% in my mind.
As the heading is "chance of success" it would indicated that the first roll failed to get any successes. Pushing would then mean to roll all the dice once more.
The pushed roll column should therefore just be twice the "chance of success" column, as you get another chance with all your dice effectively doubling the dice pool.
.. or is it something I am missing here?