Look at this series: 2, 6, 18, 54,

Look at this series: 2, 6, 18, 54, ... What number should come next?

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

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #36329