User blog comment:Superman37891/Tetration Tower Notation/@comment-30754445-20170605002314

Very nice.

I don't recall ever seeing such a notation for a "mixed arrow tower" before. It's cool, because writing such numbers precisely in the usual notations would be quite cumbersome:

(3,6,9)3 = {9,{6,3,3},3} with Bower arrays.

It should be noted, though, that for all but the smallest cases, the last three numbers pretty much determines the size of the final result.

For example:

(2,3,4,5,6)3 ~ (10,10,10,5,6)3 to an incredible degree of accuracy.