A155429 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,2 5,3 6,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 94, 310, 1252, 6074, 34841, 214176, 1426680, 11020627, 99435514, 1058044983, 12942244135

Offset

6,2

Links

Table of n, a(n) for n=6..20.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.0.0
.........1.0.0.0
........0.1.1.1.1
.......0.0.0.0.0.1
......1.1.0.0.0.1.0
.....1.0.1.0.0.0.0.0
....0.0.0.1.0.1.0.0.0
...0.0.0.0.1.1.0.0.0.0

Crossrefs

Sequence in context: A155321 A155425 A155410 * A155346 A155398 A155431

Adjacent sequences: A155426 A155427 A155428 * A155430 A155431 A155432

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved