For fun I did a search for approximations to the function with Eureqa. I get exp(0.0319x(naturalLogOfLastValue) + 1.056xn^2 - 0.184). Some other approximations

For fun I did a search for approximations to the function with Eureqa. I get exp(0.0319x(naturalLogOfLastValue) + 1.056xn^2 - 0.184). Some other approximations here: http://i.imgur.com/w84aPWs.png?1 http://i.imgur.com/w84aPWs.png?1 Note they are all in the log domain.