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Difference is 5,7,9,11,13

Second difference is 2

(2x)^2 gives 4,9,16,25

Difference between 2x^2 and sequence is -5

Thus, the nth term will be (2n)^2-5

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13y ago
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Q: What is the nth term for the sequence minus1 4 11 20 31 44?
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