User blog comment:GamesFan2000/There aren't enough particles in the universe to solve a four-entry array/@comment-30754445-20181129104403/@comment-30754445-20181130091023

Nope.

BEAF and BAN work exactly the same for linear arrays. And this shared notation is the original array notation. The only change that ever occured in linear BEAF is that the base-rule for {a,b,1} was changed from {a,b,1}=a+b to {a,b,1}=a^b. But trying to expand {4,4,4,4} with this old base-rule won't get us any closer to the expression you've written (quite the opposite) so that's not the source of the problem.

Can you post the portion of your expansion that lead to {4,4, {4,4, {4,4,4}}, 2}?

(by the way, this is why I dislike array notations. They are terribly confusing visually. One tiny oversight regarding where the parenthesis are placed, and boom! We've made an error)