A155283 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 190, 798, 5458, 43604, 402857, 5033744, 71523854, 1310467409, 28108624809

Offset

5,2

Links

Table of n, a(n) for n=5..16.

Example

Maximal 12 X 12 X 12 example
..............1
.............1.0
............1.0.1
...........0.1.0.1
..........0.0.1.0.1
.........0.0.0.1.0.1
........1.1.1.0.0.1.0
.......1.0.0.0.0.1.0.0
......1.0.1.0.0.0.0.0.0
.....1.0.1.0.1.0.1.1.1.1
....0.0.1.0.0.1.0.0.0.0.1
...1.1.1.0.0.0.1.1.1.1.0.1

Crossrefs

Sequence in context: A173872 A155241 A155222 * A155282 A193646 A155236

Adjacent sequences: A155280 A155281 A155282 * A155284 A155285 A155286

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved