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} ?
Answer Choices
A. 401
B. 485
C. 585
D. 626
E. 761