The number sequence are in the pattern of $$+1, +2, +3, +4, +5, \cdots $$ 
Find the missing term in the following sequence: $$1, 2, 4, 7,~\uline{~~~~~~~~~~}~, 16$$. 
1: $$10$$ 
2: $$11$$ 
3: $$12$$ 
4: $$13$$ 
5: $$14$$ 