A155222 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 184, 1433, 15532, 213600, 3754855, 93144364, 3159998575, 143228568126, 8737142545792, 720729233703571

Offset

3,2

Links

Table of n, a(n) for n=3..15.

Example

Maximal 12 X 12 X 12 example
..............0
.............1.1
............0.0.1
...........1.0.0.1
..........1.0.0.0.0
.........0.1.0.0.1.1
........1.0.1.0.1.0.0
.......0.1.0.0.1.0.1.0
......0.0.1.1.0.0.1.0.1
.....1.1.0.0.0.1.1.0.0.1
....1.0.0.0.1.0.0.0.1.0.1
...1.0.1.1.1.0.1.1.1.0.1.0

Crossrefs

Sequence in context: A298683 A173872 A155241 * A155283 A155282 A193646

Adjacent sequences: A155219 A155220 A155221 * A155223 A155224 A155225

Keyword

nonn

Author

R. H. Hardin, Jan 22 2009

Status

approved