98214domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155407Accumulation of the upper left triangle used in binomial transform of nonnegative integers.at n=12A276659