65847domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155302G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n * Product_{k=1..n} (1 + k*x), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.at n=7A193207