what will be the next number in the following series

what will be the next number in the following series?? 4,18,...,100,180,294

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

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #27645

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