A155278 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 45, 176, 869, 4190, 22684, 148480, 1138974, 10542605, 112293430

Offset

5,2

Links

Table of n, a(n) for n=5..16.

Example

Maximal 12 X 12 X 12 example
..............1
.............1.0
............1.0.1
...........1.0.1.0
..........1.0.1.0.0
.........1.0.1.0.0.0
........0.0.1.0.1.0.1
.......0.0.1.0.0.1.0.1
......0.0.0.0.0.0.1.0.1
.....1.1.1.1.1.1.0.1.0.1
....0.0.0.0.0.0.0.0.1.0.1
...1.1.1.1.1.1.0.0.0.1.0.1

Crossrefs

Sequence in context: A149226 A155386 A155330 * A155237 A155223 A155219

Adjacent sequences: A155275 A155276 A155277 * A155279 A155280 A155281

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved