Infinite, almost any formula will do. Just try it:you give some formula which depends on some parameters and try with different random values, until you get a orbit that remains in the window producing an image.

Why not use directly the computer to discover new interesting formulas?

Is this the task of program ** ufattr ** that tries many different formulas
keeping only those that give images in a window. In time a data base with
around 50,000 formulas has been created. The search is continuing and the data
base continues to grow.

Click here to look at the last found

Maintained by Giuseppe Zito : Giuseppe.Zito@cern.ch