90210domain: NAppears in sequencesa(n) = 3*n^3 + n^2 - 4*n.at n=31A083127Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 4,1 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155364