BEAF Structures help

Bowers' Exploding Array Function Tetrational+ Structures
I want to create BEAF Structures in Snap! without having to make any other blocks to approximate it. I've made Planar Arrays and a aX+b&c block that is based off of it. However, beyond that is X^2 and more, which is more complicated to make as an array itself. Plus beyond X^n is Tetrational arrays, Pentational arrays, and more arrays. Is there any way to perform arithmetic on this "X" without having to make any other inline array blocks or my own arithmetic blocks to just approximate it? Maybe I don't even have to make the {a,b(2)c,d} block!