The missing number of the sequence 0, 2, 8, 18, __, 50 is :

32
The sequence is based on the following pattern :
$latex 2\times 0^{2} = 0$
$latex 2\times 1^{2} = 2$
$latex 2\times 2^{2} = 8$
$latex 2\times 3^{2} = 18$
$latex 2\times 4^{2} = \underline{32}$
$latex 2\times 5^{2} = 50$
Hence the missing number is 32.