A155277 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 210, 1580, 9923, 75893, 791786, 9986174, 154732984

Offset

5,2

Links

Table of n, a(n) for n=5..14.

Example

Maximal 12 X 12 X 12 example
..............0
.............1.1
............1.0.0
...........1.0.1.0
..........1.0.1.0.0
.........1.0.1.0.1.1
........0.0.1.0.0.0.1
.......0.1.1.0.0.1.0.1
......0.0.0.0.0.0.1.0.1
.....1.1.1.1.1.0.0.1.0.1
....1.0.0.0.0.0.1.0.1.0.0
...0.0.1.1.1.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A155282 A193646 A155236 * A090042 A266882 A078952

Adjacent sequences: A155274 A155275 A155276 * A155278 A155279 A155280

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved