A155263 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,1 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 100, 864, 5014, 38110, 471622, 5596502, 85749877, 1841914431, 44860386415

Offset

4,2

Comments

Same series for 1,0 1,1 2,0 3,0 3,1 4,0 polyhexes.

Links

Table of n, a(n) for n=4..15.

Example

Maximal 11 X 11 X 11 example
.............0
............0.1
...........0.0.1
..........1.0.1.0
.........1.0.0.1.1
........0.1.0.0.1.0
.......1.1.0.0.0.0.1
......0.1.0.1.0.0.0.1
.....0.0.0.0.1.1.0.1.0
....1.1.0.1.0.0.1.0.1.1
...0.0.1.1.1.0.1.1.0.1.0

Crossrefs

Sequence in context: A043970 A183339 A331763 * A155228 A126367 A139926

Adjacent sequences: A155260 A155261 A155262 * A155264 A155265 A155266

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved