Observational Skills

It is not hard to observe

$\large 1^{3}+3^{3}=28$

$\large 2^{3}+4^{3}=72$

$\large 3^{3}+5^{3}=152$

$\large 4^{3}+6^{3}=280$ Hence the next term will be

$\huge 5^{3}+7^{3}=468$

And the general term of the series is

$\large n^{3}+(n+2)^{3}$