A155324 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 133, 535, 2615, 17587, 119298, 919700, 8881748, 102328225, 1400493835, 22807381469, 434028590353

Offset

5,2

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........1.0
..........0.1.1
.........0.1.1.0
........0.0.0.1.0
.......0.1.0.0.1.0
......1.1.0.0.0.0.0
.....0.1.1.0.0.0.1.0
....0.1.0.0.1.1.1.1.1
...0.1.0.0.0.0.0.1.0.0

Crossrefs

Sequence in context: A155422 A155370 A155442 * A155325 A155255 A155251

Adjacent sequences: A155321 A155322 A155323 * A155325 A155326 A155327

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved