A155426 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,0 4,1 4,2 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 22, 55, 188, 612, 2433, 12227, 68641, 419235, 2949869, 24062426, 221080988, 2326692356

Offset

5,2

Links

Table of n, a(n) for n=5..19.

Example

Maximal 10 X 10 X 10 example
............1
...........1.0
..........0.1.0
.........0.0.1.0
........1.1.1.0.1
.......1.0.0.0.0.1
......0.0.0.0.0.1.0
.....0.1.1.0.0.1.0.0
....0.1.0.1.0.0.1.1.1
...1.1.0.0.1.1.0.0.0.1

Crossrefs

Sequence in context: A155407 A318416 A124697 * A155421 A155343 A155341

Adjacent sequences: A155423 A155424 A155425 * A155427 A155428 A155429

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved