Looking at the sequence, it seems like we subtract 3 first and then multiply it by 4. See the pattern below:
6 - 3 = 3
3 x 4 = 12
12 - 3 = 9
9 x 4 = 36
36 - 3 = 33
33 x 4 = 132.
Therefore, the next number after 33 is 132.
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