<image>Arrange several small circles of the same radius in the pattern shown in the image: 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 the pattern,
(1) the 5th figure has ______ small circles, the 6th figure has ______ small circles.
(2) the nth figure has ______ small circles.