A155445 Number of ways to place zero or more nonadjacent 1,0 2,1 2,2 3,1 3,3 4,2 4,3 5,4 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 4, 10, 19, 40, 123, 434, 1945, 8733, 42692, 242511, 1635703, 12770421, 112939524, 1121434189, 12675288592, 164781726936

Offset

5,2

Links

Table of n, a(n) for n=5..21.

Example

Maximal 10 X 10 X 10 example
............0
...........1.0
..........0.1.1
.........0.1.0.1
........0.0.1.1.0
.......0.1.0.0.1.0
......1.1.0.0.0.0.0
.....1.0.1.0.0.1.1.0
....0.1.1.0.1.1.0.1.1
...0.1.0.0.0.0.1.1.0.0

Crossrefs

Sequence in context: A301160 A097116 A155380 * A133952 A155348 A155269

Adjacent sequences: A155442 A155443 A155444 * A155446 A155447 A155448

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved