Okay, I finally found a way that gets us one more iteration. The exact next value is:
168668479408755201
Assuming your approximation "7 Quadrillion" means 7e15 (rather than 7e24 [1]), this is about 24 times as much.
168668479408755201
Assuming your approximation "7 Quadrillion" means 7e15 (rather than 7e24 [1]), this is about 24 times as much.
Reason I say this is - let's assume all 159 million bangs are expanded then 159*159 millions = 25 quadrillion
16866847940875521
which is just 2.4 times as much as your approximation.
It would be nice if somebody could confirm my numbers indepdently.