A155351 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,3 5,4 6,4 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 43, 186, 784, 3370, 18899, 119653, 885804, 7733006, 76760124

Offset

6,2

Links

Table of n, a(n) for n=6..17.

Example

Maximal 10 X 10 X 10 example
............1
...........1.0
..........0.1.0
.........0.0.1.0
........0.0.0.1.0
.......0.1.1.0.1.0
......0.1.0.0.1.0.0
.....0.1.0.0.0.0.0.1
....0.1.0.1.1.1.1.1.0
...1.1.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A155403 A155350 A155312 * A155430 A155247 A113927

Adjacent sequences: A155348 A155349 A155350 * A155352 A155353 A155354

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved