A155323 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 2,2 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 61, 547, 3879, 20553, 82301, 862099, 11383399, 147116137, 1584915709, 26192809787, 600459150255, 15941874201057

Offset

4,2

Comments

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

Links

Table of n, a(n) for n=4..19.

Example

Maximal 9 X 9 X 9 example
...........1
..........0.1
.........1.1.1
........0.0.1.0
.......0.0.1.0.0
......0.0.0.0.0.0
.....1.0.1.0.1.1.1
....0.1.1.0.1.1.0.0
...1.1.1.0.1.0.1.0.0

Crossrefs

Sequence in context: A155352 A155361 A155315 * A121091 A213489 A288021

Adjacent sequences: A155320 A155321 A155322 * A155324 A155325 A155326

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved