A155328 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,0 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 13, 45, 200, 827, 3807, 19771, 133675, 1067815, 10084717, 113366836, 1442256377

Offset

5,2

Links

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

Example

Maximal 8 X 8 X 8 example
..........1
.........0.1
........1.0.1
.......1.0.1.1
......1.0.0.0.1
.....1.1.0.0.0.1
....1.0.0.0.1.0.0
...1.0.1.1.1.1.1.1

Crossrefs

Sequence in context: A149431 A149432 A155397 * A096353 A034553 A320743

Adjacent sequences: A155325 A155326 A155327 * A155329 A155330 A155331

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved