<image> (Autumn 2015 • Guanyun County Monthly Exam) Small circles with the same radius are arranged according to the pattern shown in the figure: the 1st figure has 6 small circles, the 2nd figure has 10 small circles, the 3rd figure has 16 small circles, the 4th figure has 24 small circles, ... According to this pattern, the number of small circles in the 7th figure is ____, and the number of small circles in the nth figure is ____.