In the sequence which begins $$2$$, $$3$$, $$5$$, $$10$$, \ldots{} each number after the second is the sum of all the previous numbers in the sequence.  What is the $$10^{\text{th}}$$ number in the sequence? 
选项为:A:$$47$$  B:$$170$$  C:$$640$$  D:$$1280$$  请回答其中一个选项.