User blog comment:SuperSpruce/The T array function: Part 2: Dimensional Arrays/@comment-38080588-20190222205602/@comment-36984051-20190223184500

Then you do T_n[ [n] ]=T_(T_(...(T_n[ [n-1] ])...)[ [n-1] ])[ [n-1] ]).

T_n[0] has a growth rate of ω2.