I don't think calculating frequencies is enough.
A truly random sequence should not have repeated patterns or other ways to predict a number given its predecessors
Well the sequences of numbers I have, should be random, HOWEVER, there are rules to the numbers generated, in a given set of 20 numbers(with any number between 1-80), no number should repeat. This by itself I suppose already breaks the chain of truly random.
There is also another caveat, the numbers, when I get them are ordered from descending to ascending order, but they are generated in a random fashion. I can't change this.