User blog comment:All Things Logical/ABACABADABACABA numbers/@comment-5529393-20171128045632/@comment-33716216-20171128115159

Here's a function that grows faster:

ABACABADABACABA(x, y). This means y iterations of ABACABADABACABA(x). If we have, say, ABACABADABACABA(TREE(609), 377), that number would be pretty big.