A155399 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 5,1 6,0 6,1 polyhexes in any orientation on a planar n X n X n triangular grid.

1, 7, 19, 43, 239, 1041, 3863, 18481, 111137, 720077, 5291974, 48305684

Offset

6,2

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........1.1
..........0.0.1
.........0.0.0.1
........1.1.0.1.0
.......1.0.0.0.1.0
......1.0.0.0.0.1.1
.....0.1.0.0.0.0.0.0
....0.1.0.1.1.1.0.0.1
...1.1.0.1.0.0.1.1.1.0

Crossrefs

Sequence in context: A155430 A155247 A113927 * A330854 A268926 A212955

Adjacent sequences: A155396 A155397 A155398 * A155400 A155401 A155402

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved