A155359 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 3,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 106, 470, 2439, 14648, 89078, 630810, 5607878, 61467315, 775395804, 11138538259, 187481058138

Offset

5,2

Comments

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

Links

Table of n, a(n) for n=5..19.

Example

Maximal 10 X 10 X 10 example
............0
...........1.0
..........1.1.1
.........0.1.1.0
........0.1.0.0.0
.......0.1.0.0.1.0
......0.0.0.0.0.1.0
.....1.1.0.0.0.0.1.1
....0.1.1.1.1.0.1.1.1
...0.1.1.0.0.0.0.1.0.0

Crossrefs

Sequence in context: A155416 A155391 A155400 * A098481 A155334 A155422

Adjacent sequences: A155356 A155357 A155358 * A155360 A155361 A155362

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved