A155365 Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,1 4,1 5,0 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 176, 778, 2821, 12886, 88605, 593766, 4348497, 42965155, 470395612

Offset

6,2

Links

Table of n, a(n) for n=6..18.

Example

Maximal 10 X 10 X 10 example
............0
...........1.0
..........1.1.0
.........0.0.1.0
........1.1.0.1.0
.......0.1.0.0.1.1
......0.1.0.0.0.1.0
.....0.1.0.0.0.0.0.1
....0.1.0.1.1.1.1.1.1
...0.1.1.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A155318 A367649 A155280 * A155364 A155332 A155388

Adjacent sequences: A155362 A155363 A155364 * A155366 A155367 A155368

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved