Is it possible to trace the family tree of humans to a single entity?

For example if there was one, one would give birth to two, and two to four.

1

2

4

8

16

32

...

etc.

1/2=0.5

That is halfway.

So then the correct equation (depending upon our generation, because we are not the singularity) is...

n/2x/4x

This is the formula.

However to discover n we must work the equation in reverse...

n*2n*4n

...or...

8*n*n*n (8n^3)

...and...

8/n*n*n

There are three n's in eight. What does n equal?

2*2*2=8

n=2.

Is this mathematics correct??