A155257 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 13, 28, 111, 502, 2990, 22461, 175998, 1776694, 23271927, 358397754, 6862062854, 158641875413, 4463737522965, 156583615357383

Offset

3,2

Comments

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

Links

Table of n, a(n) for n=3..18.

Example

Maximal 10 X 10 X 10 example
............1
...........1.1
..........0.0.1
.........1.0.1.1
........1.1.0.0.0
.......1.0.0.1.1.0
......1.1.0.0.1.0.0
.....0.0.0.1.1.0.0.0
....1.0.1.0.1.0.1.0.1
...1.1.1.1.0.0.1.1.1.1

Crossrefs

Sequence in context: A155266 A155413 A155326 * A155224 A155238 A155320

Adjacent sequences: A155254 A155255 A155256 * A155258 A155259 A155260

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved