220676domain: NAppears in sequencesNumber of unrooted triangulations with reflection symmetry of a hexagon with n internal nodes.at n=10A005507n*10^5-1, n*10^5-3, n*10^5-7 and n*10^5-9 are all prime.at n=27A064979Number of connected, unlabeled, unrooted distance-hereditary graphs on n vertices.at n=10A277862