The last two Tikkunim can be written as
15! + (16*29)^2 = (16*(71500-29))^2
16! + (64*29)^2 = (64*(71500-29))^2
and signify 16 generations of 29 years after the Arizal, respectively 64 generations after Rashbi, until 5796, until Keter, until Aleph, a thousand.
Before this world was created, Din (71) and Chesed (72) were in equilibrium. The equilibrium was broken by 29 which became the vehicle for the Tikkun, through long years of exilic darkness.
