21
t(n) = (-5n4 + 66n3 - 271n2 + 450n - 216)/24, where n = 1, 2, 3, ...
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11 comes next.
It is: 4554
0.01215
A series is a set of partial sums of sequences of numbers. A single number, such as 135, does cannot define a series.
17 cause it is the next prime number