Write the Maclaurin series for $f(x) = 3 x^2 e^{-7 x}$ as $\displaystyle \sum_{n=0}^\infty c_n x^n.$
Find the first six coefficients.

$c_0$	=
$c_1$	=
$c_2$	=
$c_3$	=
$c_4$	=
$c_5$	=