A155249 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,1 2,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 2, 4, 8, 14, 47, 195, 837, 3369, 18578, 136739, 1165320, 10402584, 111016225, 1486854375, 24007190141, 439055546197, 9360979774817, 239960578837701, 7384548591700592, 266113431327167571

Offset

2,2

Links

Table of n, a(n) for n=2..22.

Example

Maximal 8 X 8 X 8 example
..........1
.........1.1
........1.1.1
.......0.0.0.0
......0.1.1.1.0
.....1.0.1.1.0.1
....1.1.0.1.0.1.1
...1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A093483 A028398 A359695 * A118884 A118890 A118869

Adjacent sequences: A155246 A155247 A155248 * A155250 A155251 A155252

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved