Using the position-to-value rule
Un = (17n4 - 190n3 + 721n2 - 1064n + 540)/4
the next number is 276.
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