263230domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 2, 3, 6 and 9.at n=28A136894Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155251