$2^2 = 4$,
$4^2 = 16$,
$6^2 = 36$,
$9^2 = 81$,
$30^2 = 900$,
$1^3 = 1$,
$2^3 = 8$,
$4^3 = 64$,
$5^3 = 125$,
$30^3 = 27000$.