There are not enough numbers to be certain.
The rule for the nth term could be
Subtract 6 from the previous term giving 30, 24, 18, etc
or
Multiply previous term by 0.8 giving 30, 24, 21.6, etc
etc
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81
The next is 3.
75. The sequence is:- multiply by three, divide by two, add one.
It is impossible to say what sequence comes after the given set of numbers. What I can do is to suggest what number might come next in the given sequence.Using the ruleUn = (7n5 - 129n4 + 891n3 - 2859n2 + 4298n - 1488)/24 for n = 1, 2, 3, ...the next number is 85.
68