What is the next number in this sequence: 1, 11, 21, 1211…

What is the next number in this sequence: 1, 11, 21, 1211, 111221, 312211, 13112221, _________?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #17420

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