<image>The following patterns are all made by assembling small sticks of the same length according to a certain rule: assembling the 1st pattern requires 4 small sticks, assembling the 2nd pattern requires 10 small sticks, and so on. According to this pattern, assembling the 8th pattern requires ___ small sticks, and assembling the nth pattern requires ___ small sticks. (Each side of a small square is the length of one matchstick)
