login
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.
0
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.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved