A155436 Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,2 3,3 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 76, 284, 1948, 12241, 60886, 350497, 2915669, 33310308, 416154595, 5212602941, 75431474711, 1382363604714, 31384746574285

Offset

5,2

Links

Table of n, a(n) for n=5..21.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.1.0
.........1.0.1.1
........0.1.1.0.0
.......0.1.0.0.1.0
......1.0.0.0.0.1.1
.....0.1.1.0.0.1.0.1
....0.1.0.1.1.0.1.1.0
...0.0.1.1.0.0.1.0.0.0

Crossrefs

Sequence in context: A155438 A155396 A155411 * A155440 A155327 A155363

Adjacent sequences: A155433 A155434 A155435 * A155437 A155438 A155439

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved