17.
The sequence is generated by:
Un = (3n5 - 55n4 + 395n3 - 1385n2 + 2482n - 1320)/120 for n = 1, 2, 3, ...
59 is the next number in this series.
The next number in the series is 67.
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
One number does not make a sequence (nor a series).
There is no series of number: just one very large number!
8
243
20
25
73791170
108