BulldogLowell:
“Sequence” would imply, plural. Random would imply, well, random.
Well, the fact that they said "numbers between a range" implies that they are not using precise mathematical language. I take "random sequence of (the) numbers (in) a range" to possibly mean a random permutation of those numbers. The OP has not provided any answers or additional comments so I guess we may never know what they actually meant.