Negative Fibonacci :) Dec 11, 2015 • {"login"=>"77minds", "email"=>"77minds@gmail.com", "display_name"=>"Karthikeyan", "first_name"=>"", "last_name"=>""} ....... 21,-13, 8, -5, 3, -2, 1, -1, 0, 1, 1, 2, 3, 5, 8, 13, 21 ......