A155296 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 70, 328, 1523, 7988, 53382, 440756, 4250070, 49171805, 677879590, 10958762075

Offset

5,2

Links

Table of n, a(n) for n=5..17.

Example

Maximal 12 X 12 X 12 example
..............1
.............0.1
............0.0.1
...........0.0.1.0
..........0.0.0.1.0
.........0.1.0.0.1.0
........0.1.0.0.0.0.0
.......1.1.0.0.0.1.1.1
......1.0.0.1.1.1.0.0.0
.....1.0.0.0.0.0.0.0.0.0
....0.0.1.1.1.0.0.0.1.1.1
...1.1.1.0.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A122484 A155242 A155333 * A155463 A318483 A005516

Adjacent sequences: A155293 A155294 A155295 * A155297 A155298 A155299

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved