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45

Rule: add three times the difference of the previous two numbers:

5 to 6 is a difference of 1

Next number is 6 + 1 x 3 = 6 + 3 = 9

Next number is 9 + 3 x 3 = 9 + 9 = 18

Next number is 18 + 9 x 3 = 18 + 27 = 45

Next number is 45 + 27 x 3 = 45 + 81 = 126

etc

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Q: What is the next number in sequence 5 6 9 18?
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