<image>As shown in the image, the pattern consists of several equilateral triangles made using matchsticks:

(1) Complete the blanks in the following table:
\frac{}(2) A student arranges the pattern using several matchsticks as shown in the image. After arranging the first figure, they proceed to the second figure, then the third figure, and so on. After finishing the nth figure, they have 22 matchsticks left. When they finish the \(n+1\)th figure, they have 1 matchstick left. How many figures did they finally arrange?