A155414 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,0 3,1 4,0 5,1 6,1 polyhexes in any orientation on a planar n X n X n triangular grid.

1, 7, 19, 52, 254, 1049, 4097, 19919, 121609, 822616, 6525958, 61351204

Offset

6,2

Links

Table of n, a(n) for n=6..17.

Example

Maximal 10 X 10 X 10 example
............1
...........1.0
..........0.1.0
.........1.1.0.1
........1.0.0.0.1
.......0.1.0.0.1.0
......0.1.0.0.0.1.1
.....0.0.0.0.0.0.0.1
....0.1.1.0.1.1.0.1.0
...1.1.0.1.1.0.0.0.1.0

Crossrefs

Sequence in context: A155309 A155419 A155246 * A155374 A155272 A092053

Adjacent sequences: A155411 A155412 A155413 * A155415 A155416 A155417

Keyword

nonn

Author

R. H. Hardin, Jan 22 2009

Status

approved