Equal InCircles along a line

Japanese mathematics flourished during Edo period 1603-1867 and was depicted on wooden tablets called Sangaku. There is a rich history of geometric theorems and problems recorded on these tablets. Consider the incircle C of radius r of any triangle (each side of the triangle is tangent to the circle) and the extended line L along one side of the triangle. Construct a triangle with base common to L and an incircle of radius r on either side of the triangle. Continue this process on either side of the group of triangles until n triangles are constructed, n>2. The incircle of the triangle formed by the combination of any a, 2≤a