5 - 1 = 4 = 2^2
14 - 5 = 9 = 3^2
30 - 14 = 16 = 4^2
55 - 30 = 25 = 5^2
Start with 1, then add 2^2, 3^3, 4^2, 5^2, 6^2, etc.
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