|
| |
|
|
A155326
|
|
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 3,1 4,0 5,1 polyhexes in any orientation on a planar n X n X n triangular grid.
|
|
0
|
|
|
|
1, 4, 13, 28, 111, 502, 1855, 10932, 85106, 591988, 5415550, 64685900, 769802654, 11442223576
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
4,2
|
|
|
COMMENTS
|
Same series for 1,0 1,1 2,0 2,1 3,0 4,0 4,1 5,1 polyhexes.
|
|
|
LINKS
|
Table of n, a(n) for n=4..17.
|
|
|
EXAMPLE
|
Maximal 8 X 8 X 8 example
..........1
.........0.1
........1.1.0
.......0.1.0.1
......1.1.0.1.0
.....0.0.0.0.1.1
....1.1.1.1.0.1.0
...1.0.1.0.1.0.1.1
|
|
|
CROSSREFS
|
Sequence in context: A009561 A155266 A155413 * A155257 A155224 A155238
Adjacent sequences: A155323 A155324 A155325 * A155327 A155328 A155329
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Jan 22 2009
|
|
|
STATUS
|
approved
|
| |
|
|
