y = r^{n-1} sin((n-1) t)/(2 (n-1)) + r^{n+1} sin((n+1) t)/(2 (n+1))

z = r^{n} cos(n t) / n

0 <= r, 0 <= v <= 2 pi

n = 3

n = 4

n = 5

n = 6