A155282 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 201, 1391, 8373, 61097, 625360, 7715937, 116261530, 2213148571

Offset

5,2

Links

Table of n, a(n) for n=5..15.

Example

Maximal 12 X 12 X 12 example
..............0
.............0.1
............1.1.0
...........1.0.0.1
..........1.0.1.1.0
.........1.0.1.0.0.0
........0.0.1.0.1.0.1
.......0.0.1.0.0.1.0.1
......1.1.0.0.0.0.1.0.1
.....0.0.1.1.1.1.0.1.0.1
....1.1.0.0.0.0.0.1.0.1.0
...0.0.1.1.1.1.0.0.1.0.1.0

Crossrefs

Sequence in context: A155241 A155222 A155283 * A193646 A155236 A155277

Adjacent sequences: A155279 A155280 A155281 * A155283 A155284 A155285

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved