Answer
See below.
Work Step by Step
According to the exercise:
$a_1=7(1)^3=7$
$a_2=7(2)^3=56$
$a_3=7(3)^3=189$
$a_4=7(4)^3=448$
$a_5=7(5)^3=875$
$a_6=7(6)^3=1512$
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