56, 5
Every other number starting with 1 counts up by one.
Every other number starting with 3 is a multiple of three.
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The next number in the sequence is 27.
The next number is 4, followed by -2
The next number in the sequence is 27. To get the next number, double the number and add one. Except for the second number, all the numbers in the sequence follow this rule.
1/2 (By dividing -1/2)
3,263,442