228435

Appears in sequences

• Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 4,2 4,4 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=9A155409
• Expansion of e.g.f.: exp(exp(x) + x^2 - 1).at n=9A355337