277288339domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of ways to place zero or more nonadjacent 1,0 2,0 2,2 3,0 3,2 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=12A155440Prime numbersat n=15086636