A155316 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,2 3,0 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 19, 34, 64, 439, 3090, 19210, 101422, 504509, 4329846, 55414347, 830264641, 12430929701, 182359363367, 3254398810400, 78220337119222

Offset

3,2

Comments

Same series for 0,0 1,0 1,1 2,0 2,1 2,2 3,0 3,3 polyhexes.

Links

Table of n, a(n) for n=3..20.

Example

Maximal 10 X 10 X 10 example
............1
...........1.1
..........1.0.1
.........1.0.0.1
........0.0.1.0.0
.......0.0.0.1.0.0
......1.0.0.0.1.0.1
.....1.0.1.1.1.1.0.1
....1.0.0.0.0.0.0.0.1
...1.1.1.1.0.0.1.1.1.1

Crossrefs

Sequence in context: A301155 A301215 A155389 * A346760 A038418 A301206

Adjacent sequences: A155313 A155314 A155315 * A155317 A155318 A155319

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved