i need a recursive algorithm for drawing the above fractal at different depths. The resulting program is supposed to be written in F# using the program snippet below (which draws the sierpinski triangle at depth 2 and can easily be changed to draw it at another depth by varying the condition if len

open ImgUtil

let rec triangle bmp len (x,y) = if len

do runSimpleApp "Sierpinski" 600 600 (fun bmp -> triangle bmp 512 (30,30) |> ignore)