A155244 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 25, 55, 171, 2026, 22295, 155502, 1596524, 35243564, 954802663, 22309276431, 693242750587, 34923093286656, 2291347312062975

Offset

3,2

Comments

Same series for 1,0 2,0 2,1 2,2 3,0 3,1 polyhexes.

Links

Table of n, a(n) for n=3..17.

Example

Maximal 11 X 11 X 11 example
.............0
............0.1
...........1.1.0
..........0.0.1.1
.........1.0.0.0.0
........1.0.0.0.1.0
.......0.1.1.0.0.1.1
......0.1.0.0.1.1.0.0
.....1.0.0.1.0.0.0.0.1
....0.1.1.0.1.1.0.1.1.0
...1.1.0.0.1.0.1.0.0.1.1

Crossrefs

Sequence in context: A350156 A155250 A155260 * A155310 A155288 A155293

Adjacent sequences: A155241 A155242 A155243 * A155245 A155246 A155247

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved