login
A155443
Number of ways to place zero or more nonadjacent 2,1 3,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 19, 37, 61, 156, 946, 6587, 32063, 128930, 679319, 5663620, 64380331, 713842124, 7200710477, 81450733059, 1198927050536
OFFSET
6,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.0
...........0.1.0
..........0.0.1.1
.........1.1.1.0.0
........0.0.0.1.0.0
.......0.0.1.0.1.0.1
......1.0.1.0.0.0.1.0
.....0.1.1.0.1.1.1.0.0
....0.1.0.1.0.0.0.1.1.0
...0.0.0.0.1.0.0.1.0.0.0
CROSSREFS
Sequence in context: A133323 A002407 A098484 * A155405 A155448 A155446
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved