After discussion with Prof. Shi-Shuo Fu and Zhi-Cong Lin, we have proved Conjecture 1. For the details, see the preprint *Proof of five conjectures relating permanents to combinatorial sequences* by Fu, Lin and me available from http://arXiv.org/abs/2109.11506.

Conjecture 2, and (3) and (4) in my comments are relatively easy, they have been proved by my graduate student Chen-Kai Ren.