What should come in place of the question mark (?) in the…

What should come in place of the question mark (?) in the following number series? 16 8 12 30 105 ?

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 #87511