A155346 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,1 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 94, 330, 1713, 11184, 64025, 403539, 3128291, 30538252, 364356710, 4898497176, 73557982663

Offset

5,2

Links

Table of n, a(n) for n=5..19.

Example

Maximal 12 X 12 X 12 example
..............0
.............0.0
............0.0.0
...........0.0.0.0
..........1.1.0.1.1
.........1.0.0.0.0.1
........0.1.0.0.0.1.0
.......0.1.0.0.0.0.1.0
......1.0.1.1.0.1.1.0.1
.....1.0.0.0.0.0.0.0.0.1
....0.1.1.0.1.0.1.0.1.1.0
...0.0.0.1.1.0.0.1.1.0.0.0

Crossrefs

Sequence in context: A155425 A155410 A155429 * A155398 A155431 A155329

Adjacent sequences: A155343 A155344 A155345 * A155347 A155348 A155349

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved