meaning of swept mesh distribution

Hi All. I created a rectangular layer where I wanted finer layers at the edges. I used a swept mesh with a distribution that used a symmetric arithmetic sequence with 10 layers and an element ratio of 5 to produce the mesh in the image attached here (see Capture.PNG) below. My question is, what is the function that is used to calculate the thicknesses of the layers and how does the ratio of 5 come in to play here? The result is what I wanted, but I don't know how to calculate exactly how thick the layers are or understand how I got them I would like to understand.