A155334 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 5,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 37, 115, 485, 2457, 16347, 114526, 862126, 8042696, 92458257, 1277007692, 21027306771, 403213961051, 9036952144101

Offset

5,2

Links

Table of n, a(n) for n=5..20.

Example

Maximal 12 X 12 X 12 example
..............0
.............0.0
............0.0.0
...........0.0.0.0
..........1.1.0.1.1
.........0.1.0.0.1.0
........0.1.0.0.0.1.0
.......0.0.1.0.0.1.0.0
......1.0.1.1.0.1.1.0.1
.....1.1.0.0.0.0.0.0.1.1
....0.0.1.1.1.0.1.1.1.0.0
...0.0.0.0.1.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A155400 A155359 A098481 * A155422 A155370 A155442

Adjacent sequences: A155331 A155332 A155333 * A155335 A155336 A155337

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved