Possibly -218, using
Un = (-27n4 + 314n3 - 1260n2 + 2041n - 1026)/6 where n = 1, 2, 3, ...
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24
what number comes next 1 -8 -16 -24 -33
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
the next answer would be 1,024
32