A155396 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 4,3 5,3 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 73, 277, 1483, 7857, 35137, 178868, 1263372, 11050443, 103009682, 1012635463

Offset

6,2

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........0.0.0
.........0.0.0.0
........0.1.1.1.0
.......0.1.0.0.0.0
......0.0.1.0.1.1.1
.....1.1.1.0.1.0.0.0
....0.0.0.0.0.1.0.0.0
...0.0.0.1.1.1.0.0.0.0

Crossrefs

Sequence in context: A155434 A155378 A155438 * A155411 A155436 A155440

Adjacent sequences: A155393 A155394 A155395 * A155397 A155398 A155399

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved