Iterations over quadratic complex functions

n iterations over a quadratic function with a complex variable z

f(z)=z^2+b

where b is a complex number; b= b₁+b₂i, and starting point (seed) z₀=z_r+z_si

b₁: real part
b₂: imaginary part

starting point (seed) z₀:
z_r: real part
z_s: imaginary part

Number of iterations - orbit/sequence length
n:

calculate Orbit

note om komplekse tal og fraktaler her