-7 -11 -15
You subtract 4 each time
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1 squared, 2 squared, 3 squared etc so the next 3 terms are 36,49 and 64.
Divide by three. 4, 4/3, 4/9
13 21 34 55
8/3, 8/9 and 8/27.
10, 48 and 116. These are derived using the cubic generator: Un = (-4n3 + 27n2 - 47n + 30)/3 for n = 1, 2, 3, ...