A155434 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,2 3,0 4,0 5,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 67, 293, 1143, 6649, 34591, 193101, 1138893, 9302387, 87311631, 959238749, 11114012263, 149535615901, 2269866358921

Offset

5,2

Links

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

Example

Maximal 10 X 10 X 10 example
............0
...........1.1
..........0.0.1
.........0.0.1.0
........1.0.1.0.0
.......0.1.1.0.1.1
......0.0.0.0.1.0.1
.....1.1.1.1.0.0.0.1
....1.0.0.0.1.0.0.0.1
...0.1.0.0.1.0.0.1.1.0

Crossrefs

Sequence in context: A155394 A155412 A155420 * A155378 A155438 A155396

Adjacent sequences: A155431 A155432 A155433 * A155435 A155436 A155437

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved