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A155341 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,0 3,1 3,2 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 10, 22, 55, 194, 784, 4435, 26044, 168125, 1273021, 11736308, 129333849, 1686140456, 25343021943, 443460444588 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
COMMENTS
Same series for 0,0 1,0 2,0 2,1 3,0 3,1 3,2 4,0 polyhexes.
LINKS
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............0.1
............0.0.1
...........1.0.1.0
..........1.0.1.1.1
.........0.1.0.0.0.1
........1.1.1.0.0.0.0
.......1.0.0.0.0.0.0.0
......0.0.1.1.0.1.1.0.0
.....0.1.0.0.1.1.0.0.1.0
....0.1.1.0.0.1.0.0.1.1.0
...1.1.0.1.1.0.0.1.1.0.1.1
CROSSREFS
Sequence in context: A155426 A155421 A155343 * A189589 A025576 A189596
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified July 17 09:59 EDT 2024. Contains 374375 sequences. (Running on oeis4.)