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A155353 Number of ways to place zero or more nonadjacent 2,1 2,2 3,0 3,1 3,3 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 82, 439, 3646, 20995, 111047, 888450, 11127243, 160502934, 2195406729, 35231318268, 762257930909, 21186573131078, 666712624377399 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
COMMENTS
Same series for 2,1 2,2 3,0 3,1 3,2 3,3 4,2 4,3 polyhexes.
LINKS
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............1.1
............1.0.1
...........0.1.1.0
..........0.1.0.0.0
.........0.0.0.0.1.1
........0.1.1.0.1.0.1
.......0.1.0.1.0.1.1.0
......0.0.1.1.0.1.0.0.0
.....1.1.0.0.1.0.0.1.1.0
....1.0.1.1.0.0.0.1.0.1.1
...0.1.1.0.0.0.0.0.1.1.0.0
CROSSREFS
Sequence in context: A155342 A155408 A155358 * A155317 A237052 A155381
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)