what follows in this line 3, -6, 12, 4, 20, ?

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what follows in this line
3, -6, 12, 4, 20, ?

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    2021-10-13T20:45:23+00:00

    First differences are -9, +18, -8, +16, suggesting that the next ones will be -7, +14.

    Hence, the next two terms might be expected to be 13, 27.

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