A155340 Number of ways to place zero or more nonadjacent 1,0 2,0 3,1 3,2 3,3 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 61, 257, 2034, 12328, 53385, 258324, 2321815, 29642532, 362215522, 3875443645, 50070184746, 929942357232, 22058196563695

Offset

5,2

Comments

Same series for 1,1 2,1 2,2 3,0 3,1 4,2 4,3 5,3 polyhexes.

Links

Table of n, a(n) for n=5..21.

Example

Maximal 10 X 10 X 10 example
............0
...........0.1
..........0.0.1
.........1.1.1.0
........0.0.0.1.0
.......0.0.0.1.0.0
......0.1.1.0.0.0.1
.....1.1.0.0.1.0.1.0
....1.0.1.0.0.1.1.0.0
...0.0.0.1.0.0.0.1.1.0

Crossrefs

Sequence in context: A155439 A155441 A155447 * A155409 A155406 A155352

Adjacent sequences: A155337 A155338 A155339 * A155341 A155342 A155343

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved