20
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270. The sequence could be t(n) = 11.5n3 - 75n2 - 159.5n - 90 (for n = 1, 2, 3, ...)
13 18 16 21 19 24 22 27 25 ... . This series consists of adding 5 to the first number and subtracting 2 from the next number, repeating the sequence in that order.
The next number in the sequence is 48.
612
The pattern is +2 /2 +3 /3 +4 /4, and the next term would be +5, or 8.