287360domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155258Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.at n=19A305477