A155384 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,1 6,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 64, 310, 1325, 5981, 32023, 203050, 1519404, 13409104, 137343202

Offset

6,2

Links

Table of n, a(n) for n=6..17.

Example

Maximal 10 X 10 X 10 example
............0
...........0.1
..........0.1.0
.........1.1.0.1
........1.1.0.0.1
.......1.0.0.0.0.1
......1.0.0.0.0.1.1
.....0.0.0.0.0.0.1.0
....1.1.1.1.0.0.0.1.0
...0.0.0.1.1.1.1.0.1.0

Crossrefs

Sequence in context: A155338 A155401 A346851 * A155218 A305483 A046137

Adjacent sequences: A155381 A155382 A155383 * A155385 A155386 A155387

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved