I've been walking up and down the tree, nothing intersects.
Instead of trying to calculate T, try using the X variable in it's place.
Correction, that is (E,A,D).
There's lots of patterns you can exacerbate by using alternate dimensions. I still can't find a formula though. Instead of (E,N,T) this is (N,A,D) world.
The implication here is that A does move linearly through N space. I still think T=X, but it might just be a lot easier that way.
I like (N,A,X) world over NAD.