A155300 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 13, 37, 136, 613, 4136, 32205, 274737, 3263659, 46765263, 810265107

Offset

5,2

Links

Table of n, a(n) for n=5..15.

Example

Maximal 11 X 11 X 11 example
.............0
............0.0
...........1.0.0
..........0.1.1.1
.........0.0.0.0.1
........1.0.0.0.0.1
.......1.0.0.0.1.0.0
......1.0.1.0.0.1.1.1
.....0.1.0.1.0.0.0.0.1
....0.0.1.0.1.1.1.0.0.1
...0.0.1.0.0.0.0.1.0.0.0

Crossrefs

Sequence in context: A333281 A195543 A262755 * A155252 A265653 A206443

Adjacent sequences: A155297 A155298 A155299 * A155301 A155302 A155303

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved