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Original sequence: 12, 36, 150, 252
Differences between terms: 24, 44, 70, 102
Differences between these terms: 20, 26, 32
Differences between these: 6, 6
Now work backwards assuming the next one in the sequence above is also a 6.
6, 6, 6
20, 26, 32, 38
24, 44, 70, 102, 140
12, 36, 150, 252, 392