Spiral Julia

Perform standard Julia calculation for the series

for each point P₀ on the complex plane. Traditional value of a = 2.0625 + 0.1425 i.

a = 2.2 + 0.33 i

a = -2.3 + 0.1 i

a = -2.4 + 0.1 i

a = -2.3 + 0.35 i

a = 1 - 0.38 i