This may seem like an ignorant question but the block reward is "controlled by" that equation, but it is not that equation, correct?

example-- if the difficulty is 20 then that equation would be

(20+2600/9)^2 = 84,745.6787

444,444,444/84,745.6787 = 5244.45

I assume that will not be the block reward itself so I am wondering how that relates to the block reward

- from page 2 I think it would be 55 or 15 but I am not a coder by any means

thanks in advance