39267086domain: NAppears in sequencesNumber of fixed hexagonal polyominoes with n cells.at n=12A001207Number of free poly-IH4-tiles (holes allowed) with n cells.at n=12A197958Number of free poly-IH5-tiles (holes allowed) with n cells.at n=12A212086Number of free poly-IH7-tiles (holes allowed) with n cells.at n=12A212416