<image> As shown in the figure, the snake model is often used by network workers to explain network operations: the number $$1$$ appears in the 1st row; numbers $$2$$ and $$3$$ appear in the 2nd row; numbers $$6$$, $$5$$, and $$4$$ (from left to right) appear in the 3rd row; numbers $$7$$, $$8$$, $$9$$, and $$10$$ appear in the 4th row, and so on. What is the 7th number from the left in the 63rd row? ______ .