A155378 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,2 4,3 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 67, 314, 2337, 14010, 66473, 405331, 3843288, 47944694, 600390745, 7673166649, 120741723116, 2464557255202

Offset

5,2

Links

Table of n, a(n) for n=5..20.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.0.0
.........0.1.1.1
........0.1.1.1.0
.......0.0.0.0.1.0
......0.0.1.0.0.0.1
.....1.1.1.0.1.1.1.0
....0.1.1.1.0.1.1.1.0
...0.1.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A155412 A155420 A155434 * A155438 A155396 A155411

Adjacent sequences: A155375 A155376 A155377 * A155379 A155380 A155381

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved