242511domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 8.at n=26A136990Number of ways to place zero or more nonadjacent 1,0 2,1 2,2 3,1 3,3 4,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=10A155445