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A155333 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 70, 241, 813, 4400, 23369, 158297, 1249218, 10771936, 115482200 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Table of n, a(n) for n=6..17.

EXAMPLE

Maximal 12 X 12 X 12 example

..............0

.............0.1

............0.0.1

...........0.0.0.1

..........0.0.0.0.1

.........1.0.0.0.1.0

........1.0.0.0.1.0.1

.......1.0.0.0.1.0.1.0

......1.0.0.0.0.0.1.0.1

.....0.1.0.1.1.1.1.0.1.0

....0.0.1.0.0.0.0.0.1.0.0

...0.0.0.1.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A228026 A122484 A155242 * A155296 A155463 A318483

Adjacent sequences:  A155330 A155331 A155332 * A155334 A155335 A155336

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified May 6 09:25 EDT 2021. Contains 343580 sequences. (Running on oeis4.)