2 raised to the nth power is 2[sup]n[/sup]
2 raised to the (n+1) power is 2[sup]n+1[/sup]
a_0 is a[sub]0[/sub]
a_n+1 is a[sub]n+1[/sub]
a_0 raised to the nth power is a[sub]0[/sub][sup]n[/sup]
a raised to the power of the square of n is a[sup]n[sup]2[/sup][/sup]