A155265 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,1 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 73, 333, 3889, 39159, 271617, 3012146, 61623325, 1541710905, 35611299121, 1059291769629, 47181801621713, 2749984961944969

Offset

4,2

Links

Table of n, a(n) for n=4..18.

Example

Maximal 12 X 12 X 12 example
..............0
.............0.1
............1.1.1
...........0.0.1.0
..........0.0.0.1.0
.........0.1.0.0.0.1
........1.1.1.0.1.1.0
.......0.0.1.0.1.1.0.0
......0.1.0.1.0.0.1.0.0
.....1.1.0.0.0.1.0.0.0.1
....1.1.0.1.1.1.0.1.1.1.0
...0.0.1.0.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A155284 A155304 A183454 * A155253 A155234 A222964

Adjacent sequences: A155262 A155263 A155264 * A155266 A155267 A155268

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved