91675domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,0 3,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155368Number of different values of x_1*x_2*...*x_n where x_1=1 and x_i-x_{i-1} is 0 or 1.at n=21A334635