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A155218 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 64, 604, 5668, 60291, 1139786, 28911749, 917529031, 42684328880, 2779416860900, 242990212063594, 29572386974464964, 5010503933132486018, 1166195763716912084751, 374917567112932723176757 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
LINKS
EXAMPLE
Maximal 13 X 13 X 13 example
...............0
..............1.1
.............1.0.0
............0.0.1.1
...........1.1.0.0.1
..........1.0.0.1.0.0
.........0.0.1.1.0.1.1
........1.0.0.0.0.1.0.0
.......1.0.1.0.1.0.0.1.1
......0.1.0.1.0.1.1.0.0.1
.....1.0.0.1.0.0.0.0.1.0.0
....1.0.1.0.0.1.1.0.1.0.1.0
...0.1.0.1.1.0.0.1.0.1.0.1.1
CROSSREFS
Sequence in context: A155401 A346851 A155384 * A305483 A046137 A193643
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)