A while ago, I had no idea sigma notation existed, and no idea how to use it. Thus, I accedentally reinvented the notation. My little chalenge to you is to determine the meaning of each symbol, and what the equation does!
Example values: 1 -> 0 2 -> 1 3 -> 5 4 -> 14 (that's all I'm giving! (did you think this would be easy?)
