A155381 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,2 3,3 4,3 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 85, 361, 2039, 11043, 58636, 358519, 2835051, 27482639, 303186845, 3695516821, 51352363033

Offset

5,2

Links

Table of n, a(n) for n=5..19.

Example

Maximal 10 X 10 X 10 example
............1
...........1.0
..........1.1.0
.........0.0.1.1
........0.0.0.1.0
.......0.0.0.1.0.0
......1.1.1.0.0.0.0
.....0.1.0.0.1.0.0.1
....0.1.0.0.0.1.1.1.1
...1.1.1.0.0.0.1.0.0.1

Crossrefs

Sequence in context: A155353 A155317 A237052 * A155393 A155314 A155321

Adjacent sequences: A155378 A155379 A155380 * A155382 A155383 A155384

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved