5 is being added to each term
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18. The pattern is 3+1=4, 4+2=6, 6+3=9, 9+4=13, so 13+5=18
18 b/c the pattern is +1,+2,+3...
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4 6 9 13 18 24 31 39 ...... Add 2 to 4 to get 6 then add 3 to 6 to get 9 then add 4 to 9 to get 13 and so on.
3 x 3 x 2 = 18. Or 13 + 3 + 2 = 18.