1047499domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155318Prime numbersat n=81951