I experimented with the non-rotated version of this formula that Jim posted a few days ago and it has some interesting features. When you substitute the parameter numbers, it looks like:
z = (z^2) * (1/(z^n + 400000))) + c
When you look for places to zoom into, it has a lot of two way symmetry just like an ordinary order 2 mandelbrot. The difference is that when you zoom in on a two way symmetry, the minbrots aren't order 2 they are a higher order that is determined by the 1/z^n part.
I really didn't answer your question but I share your curiosity.
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Mike Frazier
www.fracton.org