A155332 Number of ways to place zero or more nonadjacent 1,1 2,1 3,1 4,1 5,0 5,1 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 182, 814, 3007, 16060, 115416, 773749, 6226900, 66290928, 740922136

Offset

6,2

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........1.0
..........0.1.1
.........0.1.0.0
........0.1.0.0.1
.......0.1.0.1.1.0
......0.1.0.0.0.1.0
.....1.0.0.0.0.0.1.0
....0.1.1.1.1.1.0.1.0
...0.1.0.0.0.0.0.0.1.0

Crossrefs

Sequence in context: A155280 A155365 A155364 * A155388 A155367 A155357

Adjacent sequences: A155329 A155330 A155331 * A155333 A155334 A155335

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved