oNe, tWo, tHree, fOur,fIve,sIx etc. It is the second letter of each consecutive number
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The next number is -21
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
The next four number in the sequence are... 4,5,5 & 6
21
In this series, the 1st, 3rd, and 5th numbers double as they progress, while the 2nd. 4th, and 6th number decrease by 4. That being the case, the next 2 numbers in the series would be 24, 4.