A155432 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,2 3,3 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 19, 31, 90, 468, 2292, 9110, 38413, 235563, 1945805, 17222547, 150113688, 1482231064, 18382767078, 277079737938, 4675639304317, 86210376981027, 1821940183878931

Offset

4,2

Comments

Same series for 1,0 1,1 2,0 2,2 3,0 3,2 4,1 4,2 polyhexes.

Links

Table of n, a(n) for n=4..23.

Example

Maximal 9 X 9 X 9 example
...........0
..........1.1
.........0.1.1
........1.1.0.0
.......0.1.1.0.0
......0.0.0.0.1.1
.....1.0.1.0.1.1.0
....1.1.1.1.0.0.1.1
...0.1.0.1.0.0.1.1.0

Crossrefs

Sequence in context: A301119 A098576 A063773 * A155302 A155362 A034966

Adjacent sequences: A155429 A155430 A155431 * A155433 A155434 A155435

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved