Find out the wrong number in the series

Find out the wrong number in the series. 7, 8, 18, 57, 228, 1165, 6996

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

~8 minAnswer checked instantly

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #39991

Stuck? A gentle nudge

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Checked against the answer in AQuA-RAT.