A155330 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,0 5,0 6,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 45, 176, 869, 4190, 22684, 124296, 845950, 6444330, 59042752

Offset

6,2

Links

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

Example

Maximal 9 X 9 X 9 example
...........1
..........1.0
.........1.0.1
........1.0.0.1
.......1.0.0.0.1
......1.0.0.0.0.1
.....1.0.0.0.0.0.1
....0.0.0.0.0.0.0.1
...1.1.1.1.1.1.1.0.1

Crossrefs

Sequence in context: A066229 A149226 A155386 * A155278 A155237 A155223

Adjacent sequences: A155327 A155328 A155329 * A155331 A155332 A155333

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved