A155440 Number of ways to place zero or more nonadjacent 1,0 2,0 2,2 3,0 3,2 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 76, 332, 1823, 10749, 53165, 313295, 2436626, 24495034, 277288339, 3304478802, 44732292922, 736452039398

Offset

5,2

Comments

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

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........0.1
..........1.0.1
.........0.1.0.1
........0.0.1.1.0
.......0.1.0.0.1.0
......1.1.0.0.0.0.0
.....1.0.1.0.0.1.1.1
....1.0.1.0.1.1.0.0.0
...0.0.1.0.0.0.1.1.1.0

Crossrefs

Sequence in context: A155396 A155411 A155436 * A155327 A155363 A155395

Adjacent sequences: A155437 A155438 A155439 * A155441 A155442 A155443

Keyword

nonn,more

Author

R. H. Hardin, Jan 22 2009

Status

approved