Mandelbrot
The term Mandelbrot set is used to refer both to a general class of fractal sets and to a particular instance of such a set.
The Mandelbrot set is the set obtained from the quadratic recurrence equation
Recursive formula
Learn more:
https://en.wikipedia.org/wiki/Mandelbrot_set
You start with a specific number, and then you apply the same recursive formula, again and again, to get the next number in the sequence.
Demo
Build
To generate fractal image
go run mandelbrot.go > fractal.png