Only the current version so far — new entries appear as the app ships updates.
Hueckel Molecular Orbital HMO is a tools app by Patrick Giel with 10,000+ downloads (about 12K estimated). Rated 4.2 from 117 ratings. Released Jan 18, 2016. Install growth, rank history, SDKs and ad networks.
From the store listing: “Hueckel - approximate calculation by drawing the molecule.”