A155228 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 106, 1005, 10898, 103861, 1556609, 33473058, 935408536, 32508382331, 1526329950979, 97248083092281, 8153227821911786

Offset

3,2

Links

Table of n, a(n) for n=3..16.

Example

Maximal 10 X 10 X 10 example
............0
...........1.1
..........1.1.0
.........1.0.0.1
........0.0.0.1.1
.......1.1.1.0.1.0
......1.1.0.0.1.0.1
.....0.0.0.1.0.0.0.1
....1.1.0.0.1.1.0.1.1
...0.1.1.1.0.1.1.0.1.0

Crossrefs

Sequence in context: A183339 A331763 A155263 * A126367 A139926 A155259

Adjacent sequences: A155225 A155226 A155227 * A155229 A155230 A155231

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved