That's just a little cheeky, Dan S de Merengue.

1. You propose that there is no mathematical growth model that adequately explains 40,000 years of Aboriginal presence here.

2. I propose that there is no mathematical growth model that adequately explains 6,018 years of human presence on the planet.

3. You then ask me to propose a mathematical model that does in fact fulfill both equations' requirements.

The answer is that there is none that is as simplistic as i) take a starting number, ii) take a growth figure then iii) multiply.

The reason being, of course, that populations both grow and die. If you genuinely would like to understand the mathematical models that illustrate this - which, somehow, I doubt - Google "Conway's Game of Life". There you will see how with a given set of survival parameters, and their concomitant threats, populations grow and recede.

Enjoy.