All the FRACTINT fractals, type fn + fn, use the following instructions provided by FRACTINT :

z(0) = pixel;
z(n+1) = p1 * fn1(z(n)) + p2 * fn2(z(n))
Bailout default=64 (0 means default, fn + fn default is 64)

Two functions fn1 and fn2 and 4 parameters (real and imaginay components of p1 and p2).

Here :
fn1 = sqr() and fn2 = cotan()
real of p1 = 1, imaginary of p1 = 0
real of p2 = 8, imaginary of p2 = 0
bailout test = mod, bailout value = 0

The shape of the above fractal looks very curious.