title: how to enter a recursive formula in libreoffice
body: <p>I am making a spreadsheet in LibreOffice for a game I play. I have various monsters that I level up by giving them food. The food required doubles for each level. I want to have column A represent their current level, column be to represent how much food each monster needs for the next level and C to be the level I want to get them to. I can easily enter a formula for how much food will be needed at the top level, but I don't know how to enter a formula that adds up all the food required.
  Any help would be appreciated.</p>