A155366 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 4,0 5,0 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 13, 28, 135, 642, 2485, 11927, 77152, 533119, 4074088, 40881018, 462133122

Offset

5,2

Links

Table of n, a(n) for n=5..17.

Example

Maximal 9 X 9 X 9 example
...........1
..........1.1
.........0.0.1
........1.0.0.1
.......1.1.0.0.1
......1.0.0.0.1.1
.....1.0.0.0.0.0.0
....1.0.0.1.0.0.0.1
...1.1.0.1.1.1.1.1.1

Crossrefs

Sequence in context: A155279 A155331 A155387 * A340002 A368570 A135039

Adjacent sequences: A155363 A155364 A155365 * A155367 A155368 A155369

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved