67218

Appears in sequences

• Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 4,3 5,4 5,5 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155421
• Number of (n+2) X (3+2) 0..1 arrays with no 3 X 3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 0 or 3 and no column sum 0 or 3.at n=21A258961
• Number of graphs with n nodes having fewer than n edges.at n=12A328057