A155236 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 210, 1538, 9864, 106941, 1433656, 22817924, 508623094, 13424571091

Offset

4,2

Links

Table of n, a(n) for n=4..14.

Example

Maximal 11 X 11 X 11 example
.............0
............1.1
...........0.0.1
..........0.0.0.1
.........1.0.0.0.1
........1.0.0.0.0.0
.......1.0.1.0.1.0.1
......1.0.0.1.0.1.0.1
.....0.1.0.0.1.0.1.0.1
....0.0.0.1.0.1.0.1.0.1
...1.1.1.1.0.1.0.1.0.1.0

Crossrefs

Sequence in context: A155283 A155282 A193646 * A155277 A090042 A266882

Adjacent sequences: A155233 A155234 A155235 * A155237 A155238 A155239

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved