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A155231 Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 259, 2433, 26055, 255284, 3429704, 71355614, 1963935839, 63893300754, 2652285259513, 148465098222315 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,2
LINKS
EXAMPLE
Maximal 13 X 13 X 13 example
...............0
..............1.0
.............1.1.1
............0.0.0.1
...........0.1.1.0.0
..........1.0.0.1.1.0
.........1.1.1.0.1.0.1
........0.0.0.1.0.0.1.1
.......0.1.1.0.0.1.1.0.0
......1.0.1.0.1.0.0.0.1.0
.....1.0.1.0.1.0.1.1.1.0.1
....0.1.0.1.0.1.0.1.0.0.1.1
...0.1.1.0.0.1.1.0.0.1.1.0.0
CROSSREFS
Sequence in context: A155270 A155256 A155230 * A155261 A365444 A268239
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)