Given any number it is easy to find a rule based on a polynomial of order 5 such that the first five numbers are as listed in the question and the sixth is the given number. That is, it is easy to find a rule so that any number can be the "next" in the sequence.
The simplest rule based on a polynomial of order 4 is
Un = (-7n4 + 80n3 - 314n2 + 499n - 246)/6 for n = 1, 2, 3, ...
and according to this rule, U6 = -58.
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121202 is a single number: it is not a pattern!
The next number in the pattern is 324. Each number in the pattern is obtained by multiplying the previous number by 3.
The next number is 116.
There is no pattern here.
A single number, such as 1371321 does not make a pattern.