212331

Appears in sequences

• Expansion of 1/((1-7x)(1-8x)(1-9x)(1-11x)).at n=4A028220
• Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155237