A155313 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,2 3,0 3,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 25, 55, 97, 1087, 13473, 96815, 552449, 7876407, 210244561, 4886389831, 91609323633, 2669503927735, 132662824311297, 8063542123697063, 467664413878234705

Offset

3,2

Links

Table of n, a(n) for n=3..19.

Example

Maximal 12 X 12 X 12 example
..............0
.............1.1
............1.0.1
...........1.0.1.0
..........0.0.0.0.1
.........1.1.0.0.0.1
........1.0.0.0.1.0.1
.......0.1.1.1.0.1.1.0
......0.0.0.0.0.0.0.0.0
.....1.1.0.0.1.0.1.0.1.1
....1.0.1.0.1.0.1.0.1.0.0
...1.0.1.0.0.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A357196 A227776 A155286 * A213390 A071778 A350156

Adjacent sequences: A155310 A155311 A155312 * A155314 A155315 A155316

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved