These are square numbers of 3, 4, 5 with alternating sign, I'd expect to continue the sequence with
36, -49, 64, -81, 100
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7
36
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
The next number in the sequence is... 64
The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.