A155344 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 13, 37, 146, 632, 2601, 11932, 76177, 558787, 4627682, 46978044, 543470526

Offset

5,2

Links

Table of n, a(n) for n=5..17.

Example

Maximal 9 X 9 X 9 example
...........0
..........0.1
.........1.0.1
........1.0.1.0
.......0.1.0.1.0
......0.1.0.0.1.1
.....1.1.0.0.0.0.1
....1.0.0.1.1.1.0.0
...0.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A108489 A155375 A155307 * A155418 A155235 A024450

Adjacent sequences: A155341 A155342 A155343 * A155345 A155346 A155347

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved