A155223 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 45, 176, 869, 5649, 44314, 456024, 5472215, 82109824, 1515983373, 34737855825, 992142189277

Offset

3,2

Links

Table of n, a(n) for n=3..16.

Example

Maximal 12 X 12 X 12 example
..............0
.............1.0
............1.0.0
...........1.0.0.1
..........1.0.1.0.1
.........0.0.0.1.0.1
........1.0.1.0.1.0.1
.......1.0.1.0.0.1.0.0
......1.0.1.0.0.0.0.0.1
.....1.0.1.0.1.1.1.1.0.1
....0.0.0.0.0.0.0.0.0.0.1
...0.1.1.1.1.0.1.1.1.1.0.1

Crossrefs

Sequence in context: A155330 A155278 A155237 * A155219 A153985 A184481

Adjacent sequences: A155220 A155221 A155222 * A155224 A155225 A155226

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved