321912

Appears in sequences

• Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 4,3 4,4 5,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155393
• a(n) = (1/2)*A291383(n).at n=10A291384