A155400 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 5,2 6,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 106, 414, 1792, 8692, 50965, 347596, 2639357, 22946779, 235883238, 2823234704

Offset

6,2

Links

Table of n, a(n) for n=6..19.

Example

Maximal 11 X 11 X 11 example
.............0
............0.0
...........0.0.1
..........0.0.1.1
.........0.1.1.0.0
........1.1.0.0.1.1
.......0.1.0.0.0.1.0
......1.0.0.0.0.0.1.0
.....1.1.1.0.0.0.1.0.0
....0.0.0.1.1.1.0.1.0.0
...0.0.0.0.0.1.0.1.1.0.0

Crossrefs

Sequence in context: A155417 A155416 A155391 * A155359 A098481 A155334

Adjacent sequences: A155397 A155398 A155399 * A155401 A155402 A155403

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved