A155431 Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,1 3,2 3,3 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 94, 344, 2238, 14169, 77290, 503317, 4355803, 49651747, 642476027, 8840925123, 141069431209, 2761281750433

Offset

5,2

Comments

Same series for 2,0 2,1 3,0 3,2 3,3 4,1 5,1 polyhexes.

Links

Table of n, a(n) for n=5..20.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.1.0
.........1.1.1.1
........0.1.0.0.0
.......0.1.0.0.1.0
......1.0.0.0.0.1.1
.....0.1.0.0.0.0.1.1
....0.1.1.1.1.0.1.1.0
...0.0.1.1.0.0.1.0.0.0

Crossrefs

Sequence in context: A155429 A155346 A155398 * A155329 A155424 A155349

Adjacent sequences: A155428 A155429 A155430 * A155432 A155433 A155434

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved