A155337 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 22, 40, 161, 562, 3058, 15699, 98124, 620233, 5239100, 48386446, 558536676, 7037622489, 106784846181

Offset

4,2

Links

Table of n, a(n) for n=4..19.

Example

Maximal 9 X 9 X 9 example
...........0
..........0.0
.........1.1.1
........1.0.0.0
.......1.0.1.1.1
......0.1.0.0.0.1
.....1.0.1.0.1.0.1
....0.1.0.0.1.0.1.0
...0.0.1.1.1.0.1.0.0

Crossrefs

Sequence in context: A155360 A155382 A155287 * A155402 A155232 A188281

Adjacent sequences: A155334 A155335 A155336 * A155338 A155339 A155340

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved