The figures F_{1}, F_{2}, F_{3} and F_{4} shown are the first in a sequence of figures. For n \geq 3, F_{n} is constructed from F_{n-1} by surrounding it with a square and placing one more diamond on each side of the new square than F_{n-1} had on each side of its outside square. For example, figure F_{3} has 13 diamonds. How many diamonds are there in figure F_{20} ?

F_{l} F_{2}

F_{3}

**Answer Choices**

A. 401

B. 485

C. 585

D. 626

E. 761